for 8800gts 320mb... GPU Core 576MHz, is that good? Oh it's gone up to 75C when I played Test Drive Unlimited, pretty hot.
Did you try going into manage (right click my computer>manage) and then gone to disk management to solve your disk issue? Here you will find the status of all disks, if there is unallocated space at the end of the drive it will show, then you can right click that space and create partitions. If your wd utility could do it then I don't see why windows couldn't (before installing sp2 it might have only allowed a max size of 130GB, but should have still let you partition in the unpartitioned space). System looks great yes, only thing I would say, I have two 500GB WD drives, both of mine get really hot. They heat up the air in the case significantly, apart from that they seem like good performers. An extra case fan (cost you a couple of pound/dollars) might be worth getting to balance this, especially if you are gonna overclock. Oh yeah, overclock your cpu! I have no knowledge of the e6750 but if it's like all the other core 2 duo's it's begging to be oc'ed.
All 500GB hard disks get hot, I assure you. The seagates get hotter than the WDs. However, bear in mind I've had two faulty (out of two) 500GB WD drives, so for that capacity I recommend Samsungs now, the HD501N.
Hmm, weren't you the guys that told me that this Antec 900 hurricane fans cover the hard-drive as well? Let's see...yup, my 500GB WD is right behind the bottom fan as for the allocation, yeah I later found out that I could get there from administrative tools > disk management.