Sounds like you need to read the forums, if your going B series, check out team-integra.net and clubintegra.com
Team integra has more articles, how-to's, etc. As well as building your all important 200hp motor. You'll be hard pressed to do it on your budget or with a b18b or b18a. Stay far away from a LS-vtec conversion, they are more trouble then they are worth, if you read up on the swap you'll quickly find out that most people end up blowing up their engines from the head swap at some point in time. If your going to do it right, you can find a gsr engine with tranny for a reasonable price either online or offline. Part outs are the most popular.
car-part.com is a site that you can search junk yards for parts, just doing a local search for me netted a gsr engine and tranny for 1500, not a bad price. swap in some hotter cams, intake and exhaust and you'll start getting where you'll want to be.
Also OBD-1 is where your going to want to stay at, because of tuning issues and less problems with the ecu and CEL errors.
If you are planning to have this be a DD, one thing to consider is swapping out the 5th gear for a LS 5th gear, that goes for any of the B-series tranny's though, it'll drop you rpm's by alot while cruising on the highway saving both your ears from the drone of the exhaust and the price of fuel as well.
At first stick with the stock axle's but as you increase your power, a burn out or attempt at one will break and axle. Occasionally the various forums, such as the ones listed above, or honda tech has deals on aftermarket axle's.
If I were you I'd also take the time to do a full mil-spec wire tuck, it looks that much cleaner if your going to shows and de-clutters the engine bay.
The DX will be that way to go, they are the lightest of the models, you can always swap in power options if you wish, and the auto cars switch over easy, although you'll lose your cruise control if its not a manual car already.
you can pick up the trailing arms from an integra for cheap to swap over the rear disc brakes, just make sure you add the integra's bigger brake master cylinder, or you'll have trouble stopping and an extremely stiff pedal as well.