Yay!
I got my new shiny iMac 27" Quad core with 8G RAM, 2TB HDD and 1GB Video Card this week. Well the first thing I did was change the mouse (I like a big heavy mouse and the mac mouse was giving me cramps). The second thing I did was install World of Warcraft and boy does it look like pure sweetness *grin*.
I then installed VMWare fusion and put Win7 into a virtual machine... OMG! I'm running it in isolated mode instead of seamless mode mainly to keep them separated.
The unity function is seamless. It's fast even with only using one core and 2GB of RAM. I installed Steam and played some games (Half Life 2 etc) and they are great! The audio has a few hiccups but so far the graphics and fps (frames per second) have been phenomenal!
I may dual boot it using BootCamp if I need more Win7 power but hopefully not, I got annoyed at having to dual boot my old computer as running VM on it just didn't work well (it's old and needs to be put out to pasture).
Thanks to both Chris and Trevor who offered some good advice in regards to Fusion