Well if you can't send the block off, you're not going to be able to go 2.0L. You'll need to send it off to get it sleeved. My advice is that if the GSR is your daily driver, don't attempt a big turbo build. Shit happens, parts can break, things can go wrong during the build and take longer than anticipated. But, if you still want to do it, I'd go with a Wiseco piston and Crower rod, and like Snoopy said, leave the OEM crank in there. They can handle a lot of horsepower. Just have the rotating assembly balanced at a machine shop, and maybe have the crank micropolished a little bit. Figure a little over $1k for a good set of rods and pistons, and rings/bearings. Turbo is going to cost a bit if you buy good parts, and not go with a cheap used/junkyard setup like most people. Make sure you don't skimp out on engine management. Go Hondata or AEM EMS, something tunable, and have someone who really knows what they are doing tune it. Tuning is not the place to skimp out on a turbo build..bad tuning or no tuning can turn that brand new built motor into a hunk of shit in a matter of hours.