My first suggestion would be to go for the SSAC XS kit for the 2g. It comes not only with upper and lower ic pipes, but a huge proven core. Also the ic pipes are short route, and bigger diameter then all the ones mentioned already that are long route. Definitely inferior.
But I understand everybody has different goals.
I have experience with dejon tool, greddy, rre, etc.
The greddy serves for easier install because it doesn't replace the TB elbow. Also a nice standard finish that doesn't look bling if you are trying to be low key. But the blue couplers will have to be replaced. Not to mentioned I believe their couplers are rubber and inferior to the ones included with the other kits. Which are nice heavy duty multi-ply silicone. Also some will mention the sharp 90 degree bend that connects to the smic.
The dejon tool, I've used several times on a few 2gs I had. Nice product, you have different choices of powdercoated colors included. A while back they even included new tb bolts, but I'm not sure these days. The silicone couplers are much stronger, but they seem just barely long enough so you have to install them with the utmost preciseness. They are also on very tight, so when come to removing them, it might be a struggle. Some will complain about the very thin tb flange. I've never had a problem with it myself. Smoother run of pipe where it connects to the smic compared to the greddy.
RREs is similar to dejon tools, but requires that you cut your stock hose and use that as the coupler. I am speaking of the pipe that connects to the tb to the next pipe with the actual bov flange. Only 1 choice of default color finish. Despite the awkwardness of having to hack up your stock part to use with the new one, the TB flange is much thicker, and if I can remember, the pipe diameter seemed a bit bigger than the dejon one. But don't take my word on it. As for the pipe with the bov flange, its almost identical to the dejon one.
All of those brand NEW will cost around $225 shipped I believe.
Of course there is Punishment racing's ic pipes. ALMOST the best deal of the bunch. The $225 price I mentioned for the other brands DO NOT include the lower ic pipe. Punishment's does. Nice chrome/polished finished. Silicone couplers, etc. And of course the best value considering the price. Almost $100 cheaper and you get more.
I say "ALMOST" the best deal, because here is the same thing, for cheaper:
http://cgi.ebay.com/DSM-2G-Upper-Low...QQcmdZViewItem
That's the winner. eBAY again for the win.