In case you are still looking for a good gaming computer for Second Life, and missed out on Black Friday deals, I just found a nice buy on Amazon. It is a CyberpowerPC desktop, and have the basic requirements I mapped out for Second Life here on November 21:
An good Intel CPU (see benchmark below)
A good NVDIA graphics card (see benchmark below)
8 Gigs of RAM
1 Terabyte of Storage
A 3 of 4 year Warranty can be had for a reasonable price.
The vendor, CyberpowerPC has been known to take longer than quoted to assemble a custom desktop off their website. However, this computer appears to be available for shipment immediately (please check before you order) which should take care of that potential problem.
It amazes me how low desktop computers can cost with high quality graphics. Remember, if you buy this computer you will also need a monitor.
Here is the link if you are interested: