Just installed my first SSD (Intel 330 180GB) less than a week ago. To answer your question, it doesn't really matter if you use MBR or GPT. GPT is only necessary for large hard drives (~2tb) I believe, but either one will work fine. I STRONGLY recommend you do a clean install of windows on the SSD, and let the installer do the formatting. Also be sure to set the SATA operation mode as "AHCI" in the BIOS, or you will likely run into problems. Update your chipset and storage drivers as well. Other than that I think you should be fine. Try installing Win from a USB key for added solid-state l33tness. Check your transfer speeds after youre done against online data to make sure it's all good. If you aren't getting what you expect, there might be some issue you need to resolve.
I love mine so far, windoze loads fast, ME3 loads levels damn near instantly, no more texture pop-in either.
4690K @ 4.2/4.0, 212EVO, gtx670
DDR3-1866c9 @ DDR3-2000c9
ascend cbm170se, wiener tpa3118 amp @ 1200khz, JDSlabs ODACrevA, dayton sub-1200, belden/BJC wires