I'll be honest I'd buy the air delivery system first. Who knows when your rental reg was last serviced for real or what has happened to it. The computer would certainly be next.
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horsemen:OK after the soft stuff i was thinking of the computer seeing how rent most stuff will be fine but the computer you would want to know inside and out and renting one and possible getting a different one each time would make like hard sometimes trying to fig it out each time or do you all recommend a different route
Stirling:I would be more inclined to get the computer last, and keep diving with the tables until you have your own regulator, BC, and exposure suit. The computer is the only one that has a much cheaper and perfectly suitable alternative available (the tables). Plus, diving with the tables may reinforce your training and understanding of what they're all about.
I only warm water dive so I don't even own a suit so to my way of thinking, I'd go with:horsemen:exposure suit was in my soft gear i was just wondering about what was best to get first trying to plan out the order i should get what i just seen a few post saying the computer you had to really study it and get to know it and thought that might be a first seeing how their all different but everything you said sounds reasonable thanks for the feed back