The problem with eBay kits is that their quality is not that great.Their turbos are prone to failure, as is their manifolds.
SR is a viable choice if you only want 200hp to start off with, if you want more, you'll have to upgrade injectors, fuel pump, etc...
If you want to go with a T3, JGS has a great kit to start off with.
http://jgsturbo.com/index2.htmlGo there and click on "240SX KA24E & KA24DE Products"They have a great starter kit.
Next you'll need an ECU tune, larger fuel pump, larger injectors, exhaust, intercooler, boost gauge, and a few other things I might've missed.
As for the tune, I'm running an EFISpecialist tune with no problems, including Chris28 and a few other people on this forum.
Good luck!