Transmissions?

[bent_remy]

I have a 00 b16a2 in my civic and my transmission is almost finished. My thrid gear won't engage and my 5th gear keeps kicking back due to the fact that the tranny casing is cracked, and it has been leaking gear oil for some time now. I tried to have it welded but it remains to leak and I've been adding gear oil every other day but it is really bad now and its only a matter of time before it locks. Money is an issue right now so i'm looking for the least expensive option. I wanted to know which trannies are compatable with a 1.6L dohc engine from and si or would it be eaiser to buy a new transmission case and have it rebuilt.