New Aluminum Coolant elbows, Lim Gasket, M90 gasket, injector o-rings, formagasket, bottle of coolant, a ratchet set, some new vacuum lines (you'll probably break yours) maybe a torque wrench, possibly valve cover gaskets if yours are bad, and maybe a few other misc things i forgot. That's about all you need to do it yourself. That and about 3 or 4 hours if you take your time. It's truly not that bad.
A shop. Probably $500 with parts. You could do it yourself in half a day.
Read this:
http://www.gpona.com/forums/do-it-yo...de-t29904.html
It's for a N/a, but it's still a great guide. Long story short, do it yourself, save money, be happy.
