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Yuri, echoing what is above, you really have two options
Get what you want and will last forever, that is basically the Petrel and that's about it.
Get something cheap and will function for you in the long run as backup.
Petrel is nice because it will track constant PO2 as a backup computer for CCR, isn't all that expensive, and is by far the best. There are comments about it not being the latest and greatest, but unless some massive technology leap happens in the next 2-3 years you won't see anything substantially better than the Petrel. It's predecessor the Predator is all but identical, just a bit bigger, and has a finicky battery selection, and now with the Petrel 2, doesn't have a digital compass which few use anyway. If you buy a Petrel now, it will still be one of the top computers in 5 years time.
What I would recommend in your situation is a dive watch and an SPG. Oceanic Geo 2.0 is one that comes to mind, if you have a Mares dealer running a sale, the Mares Smart is similar. Small profile dive watch which is good for local just jump in the water recreational diving, still has multigas capability which allows you to run basic decompression dives which will cover basically everything until trimix and CCR, and can then be put in gauge mode. It's about half the price of the Petrel and significantly smaller. I love my Petrel, but it doesn't come with me for most light recreational diving because it is rather large. Issue with a Petrel is when you go to CCR, you'll likely be going to one with the Dive Can which will have a Petrel controller tied directly to the system, and you have the option for another Petrel or NERD which integrates with the CCR. That integration will give more accurate monitoring for you than a standalone. Standalones are fine, but you may as well integrate if you can, and the Fisher Connector Petrel is quite a bit more expensive for cell monitoring. For Trimix ocean dives you'll be cutting tables manually and using your computer in gauge mode, and one of the small watch computers will do that just fine.
Other option is used, Nitek Duo, Cressi Archimede II, all the other computers that Seiko made for whatever manufacturer can be had pretty inexpensively on the used market and they are good basic mixed gas computers.
Get what you want and will last forever, that is basically the Petrel and that's about it.
Get something cheap and will function for you in the long run as backup.
Petrel is nice because it will track constant PO2 as a backup computer for CCR, isn't all that expensive, and is by far the best. There are comments about it not being the latest and greatest, but unless some massive technology leap happens in the next 2-3 years you won't see anything substantially better than the Petrel. It's predecessor the Predator is all but identical, just a bit bigger, and has a finicky battery selection, and now with the Petrel 2, doesn't have a digital compass which few use anyway. If you buy a Petrel now, it will still be one of the top computers in 5 years time.
What I would recommend in your situation is a dive watch and an SPG. Oceanic Geo 2.0 is one that comes to mind, if you have a Mares dealer running a sale, the Mares Smart is similar. Small profile dive watch which is good for local just jump in the water recreational diving, still has multigas capability which allows you to run basic decompression dives which will cover basically everything until trimix and CCR, and can then be put in gauge mode. It's about half the price of the Petrel and significantly smaller. I love my Petrel, but it doesn't come with me for most light recreational diving because it is rather large. Issue with a Petrel is when you go to CCR, you'll likely be going to one with the Dive Can which will have a Petrel controller tied directly to the system, and you have the option for another Petrel or NERD which integrates with the CCR. That integration will give more accurate monitoring for you than a standalone. Standalones are fine, but you may as well integrate if you can, and the Fisher Connector Petrel is quite a bit more expensive for cell monitoring. For Trimix ocean dives you'll be cutting tables manually and using your computer in gauge mode, and one of the small watch computers will do that just fine.
Other option is used, Nitek Duo, Cressi Archimede II, all the other computers that Seiko made for whatever manufacturer can be had pretty inexpensively on the used market and they are good basic mixed gas computers.