picked up the 850 thermal take myself mainly for the upgrade room and possiblities i can look at without worrying about my psu at the same time, a good psu is always worth the money and at £100 it was a bargain.
pick up the 120gb ssd instead of 2 60's intel's ssd's have some great reviews and well worth getting.
odd choice of additional hdd's though, a 640 and a 500, at the cost of both of those a single 1-2 tb caviar black can't be much more expensive if not cheaper.
well $220 for a wd caviar black 2tb Newegg.com - Western Digital Caviar Black WD2002FAEX 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
best guess you'd be looking about $180+ for those 2 drives so not a big difference.