If you do all the work yourself anywhere from $1000 to $3000 Just depends on how cheap you can find the parts and if you go ahead and do upgrades you want, new or used transmission etc. What I have my swap priced at so far its somewhere around $1700, but since then i've found a few things a little bit cheaper.
Heres some good information on the T-5 Swap
Also there is a guy on here that has done it and was talking about doing a write up on it, you should be able to do a search and find his post.
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The guy i was talking about is GDogg08
And here are his threads:
T5 Swap Next Weekend!!!
After T5 Swap
Redfire '04 V6 - K&N CAI, Divorced duals, Bama Tune, EGR Delete, Gauge cluster LED overhaul.