Greddy xB kit vs Greddy Fit kit

[mrbond]

Well, since you would be handing your Yaris over to a shop to install it anyway, you could converse with them what you would need to build a low boost turbo kit. Also talk to Garm (caliyaris) and Tamago about what you would need to build your own turbo kit. They've posted that information a couple of times, and they would help you decide what you would need. Seriously, if you were to piece together your own setup, you WOULD be saving quite a bit of money. Later today after work I'm going to be uploading a couple of pages from Super Street magazine that goes really in depth about how a turbo setup works, and various types of turbines and what setup they work best with, so look for that.
Really, there's lots and lots of resources aimed at helping people in your position decide what to do. These resources are also well-geared towards helping people NOT waste money on things they won't necessarily need. Think of all the things you could do with that extra money: lowering springs & shocks or coilovers, brake upgrades, other suspension upgrades, etc. There's a lot to be had in all of these departments (especially turbo setups) for very little money. Just something to think about.