what kind of car and year of car do u have? if its a civic..92 and up go with a b18c1 gsr motor.(kind of expensive though) but bolts right in
if u are going to boost go with the non vtec b18b, little cheaper than b18c
or a good cheap swap overall dont not as much power as the b18's is the b16a SiR motor.
you can find the complete swaps for a decent price here: http://www.hmotorsonline.com/