I preach this all the time, there's almost no such thing as "too big" with the TB (within reason). In a fuel injected car, all the TB does is get out of the air flow's way at WOT. It is NOT like a carburetor, we don't have to worry about maintaining "velocity" to get proper fuel mixing. The only thing you have to worry about when going with a bigger aftermarket TB/EGR, is grinding the the opening in the upper intake to port match. Just slapping a bigger TB onto an untouched, stock intake leaves a big step from the diameter difference that the air will get caught up on and will actually hurt the flow.
Now, I ran a 70mm TB/EGR on a stock intake for years, and I was able to port match it just fine. In fact, I know people who have done the same, and you'll read about how to do it in magazines from time to time. That said, Gearbanger101 (a mod on this site) told me that he once broke through a intake casting trying to port match it. I guess you just have to be careful and be prepared to replace the intake if you end up breaking it.
On that same note, running a bigger aftermarket MAF meter is also a very good idea. The stock unit is so small that it actually chokes a stock engine, let alone a modified one.
Finally, a word on CAI. Back when I was young and dumb, I bought a generic CAI from Summit Racing. If I could do it all over again (which I will at some point), I'd build one from scratch. Buy a couple silicone couplers and some 3"/3.5"/4" exhaust tubing (chrome or paint it, or maybe even use painted PVC), trim it all to fit and viola: you've got a very functional, very custom CAI, and you've probably spent less than you would have on one of those kits.