I do about 75 dives in Belgium here and 15 dives in warm water each year.
First of all I'd give you the advice to buy your gear in America. It's more expensive here in Europe. I would buy your stuff online. Check out the website at Leisurepro. They are probably cheaper than your LDS.
Since you don't know if you are going to be diving cold or warm water, I'd err on the safe side. For regulators I would go for the MK17/G250 combo. They are very reliable, good breathing comfort; And they will last you a life time if you treat them right. They will also suit you as your diving progresses. They are 450 from Leisurepro.
I would not go for the Air2 option. It's hard sharing air and dumping gas will the inflator is in your mouth. I find them to be less reliable and have less breathing comfort. I would not want that in an emergency situation. But that's just my opinion. I'd go for a Scubapro R295. (150 from Leisurepro).
As for the computer, I would not go for air integrated. Imo it's too expensive for the gain you get from it. It is perfectly fine though, it's your money, if you want to buy it, please do. I would buy a Uwatec 2G. (350 from LP) It does nitrox, 2 gasses and has gauge mode. The 2 gas option will suit you if you ever decide to dive with a deco gas. The gauge mode combined with tables are useful for trimix diving. It's futureproof and very good value for money. The Suunto Cobra (500 at LP) has air integration aswell. I would look at the Suunto Zoop too if you don't really need air integration. It has nitrox mode too. (250 at LP)
The Nighthawk without the Air2 is 450 at LP. But I would go for a BP/wing setup. They are more versatile. The modular system makes sure you can adapt it to your needs. If you go to doubles you just swap out the wing. Future proof it is (see the pattern?
) I heard very good things about the Zeagle BC's too. Good value for money.
So that's 600 for the MK17/G250 + R295 combo. 450 For the Nighthawk. Thats 1050 in stead of 1350. Nice saving no? I'd consider not buying air integrated to save money and put it towards a suit or a light or... on diving. Don't forget you will probably need more gear than this. Especially if you want to dive in cold water.
I started diving 2 years ago. I bought all my gear. I have since replaced my BC with a BP/Wing, bought a new computer (Uwatec 2G) and bough another diving light (HID). Mind you, I'm going down the technical route a bit, so I might be biased towards that.
I had to type out this reply twice, something went wrong when I was finished...
PS: if you need more info PM me