i want to swap out my stock 96 honda civics engine with something faster with more aftermarket options and not to expensive any ideas?  

b16a or b18b not to expensive and its the easiest swap to do with not to difficulty  

what all would you have to change to put a b16 or b18 in a 96 civic ex?.. mine has a d16 in it right now but i wanna swap but dont know how much work it would be..  

I just finished a B20Z swap in my EK and I am very happy.  Here's the breakdown:
B20Z - $1000
GSR hydro tranny - $400 (got lucky)
LS ECU - $150
Axles - $200 or so
ACT clutch - $200 I think
Engine mount - $100
Shop labor for swap - $700

Well that's the big stuff, but the killer is the small stuff you don't remember to account for.  Flywheel resurfacing, wiring, injectors, and sensors can add up fast. If you want cheap and reliable, a B18B or B20 with an LS transmission and ECU is the best way to go.  B16s are just not torquey enough and feel just like a D16 until 6000 RPM.  Not fun.  Check out Honda-Tech.com, the thread "What swaps are available for my civic?" would be a good start.  You should have at LEAST $3000 cash on hand to spend on your swap.  I couldn't settle and ended up spending a grand total of almost $5000 for the swap and goodies like a P8R head, crower cams, Hondata S300, and a 2.5" full catless exhaust.  Cheap, fast, reliable. Pick two.