If you are talking about a reliable every day driver with some pep, then you should probably stay NA. Something like a type R or even just a GSR swap would be nice. You could also build upon what you already have, but the b16a bottom is not ideal for all motor. A nice LSvtec or b20vtec build will end up costing about what a nice complete ITR swap does and potentially have less reliability in the long run (but more power). If you are looking for a drop in swap, transmission and all, i would certainly be looking heavily at the type R or GSR swap.
dont get me wrong turbo is fun, and makes lots of power. but if you want to go that route, it will end up costing more in the long run. everyone that starts out with a low budget turbo build ends up either sinking more money into it than they wanted to, or blowing it up.