I will get the PC version. I've waited for more than a year without playing any RPG on PC, what could possibly two more months mean to me. I can wait.
I hope the modded content will make much difference. Maybe it is different from KOTOR I and Bioware overtly put down any notion of fan created content, possibly from LucasArts intellectual rights policy, or somenthing like that. I guess this ain't the case here, from what I hear on the forum.
Upgrading PC is rather tiresome, but it is fun in and of itself. I've used the current PC for more than two years, and can still play current games. If there is platform consolidation on the Xbox, the PC has scaleability. PC may require more QA though. I hope they release it a bit later if it means less bugs and incompatibility issues.