What engines (which sr20det) can go in a 00 sentra? WHich fit better than others? how much am i lookin at for labor and how much for the engine? plus, r they reliable?

The bluebird and gti-r are the most common det's that people swap in. The gti-r makes slightly more power stock, and I believe it has some extra goodies that make it better than the bb det (but I'm not sure what they are). Both will require the exact same amount of work to put in, as for prices and where to buy, there are a couple good suggestions here

http://www.sr20forum.com/showthread.php?t=64683

Thanks, u got any ideas off the top of your head of how much the labor would be?

not a clue, it really depends on what you have now

If you have a GXE then it will be high, if you have an SE it will be significantly lower. For a GXE it'd probably be a couple thousand, for an SE maybe a grand, but you'd have to go talk to a shop about it to get a real number.