Turbo pricing
#2
the first 2 stickies in this section cover a lot of general info that will help answer your questions. once you get a little more specific there's a lot of guys in here that can help you iron out a setup.
#3
For your second question, front mount turbo kits are more efficient than rear mount set-ups. However, the simplicity of the installation of the rearmount kits makes them more attractive to customers. Front mount kits usually require you to do things like relocate the battery or change accesory drive or remove your A/C unit. My advice, if it is a dedicated race car and you can live without some comforts, go front mount kit. If you want A/C and want to touch as little under the hood as possible, rear mount kit is your friend. I have a rearmount kit on my '98 T/A and I love it.
PS: turbo sizing is very different for a front mount kit vs a rear mount kit, do research before you set your heart on a turbo