I Need Help Plz

ok im new to this messege board and to Honda's....this coming summer i would like to custome build a Honda.... i need some help in deciding what kind of egine to put in....i know a little about honda engine's like b16, b18 ,h22 and so on but do not really understand what the letter that comes after the b16 A,b,c what do these mean....

if any one could guve me some examples on swap's and car's that they have build and the money that they put in to them im looking to spend around 5,000....i dont need a fast and the furius type car but i want it just fast enough for me and i want it to look good to....

the car i have right now is a 1993 civic ex with 1.6 ZC at 140 hp it's not a bad car but it's just falling apart needing tie rods and such the dam Muffler fell off last night..lol..but i need a car for the summer....