the most common swap is the b16a2 it will get you 170 Hp and it costs around $2000. If your looking on spending all $15,000 then you can look in to higher perofmance engines like B18C which will get you between 180-197 HP they cost between $3499-$5999 on
http://www.streetimports.com/homepage.htm another option is the H22a 200 HP For $2599 at street Imports.
Another place that might be work checkin is
http://www.importbuilders.com/ they sell there own rebuild engines. They sell a Hydro CRV/VTEC engine for $6000 that yeilds 372 HP and 266FT of torque. If you dont want the turbo drop 1500 off the price and the hp drops down to 225. THe turbo is alot safer with there setup because the internals can handle high boost. The Hp i quoted you is for 12 psi of boost i think the engine can handle much more. I think this is your best choice.
ryan