Need Help With Computer Build/Pre-Built

So, as a Christmas gift, I would like to get a computer for someone. They play Second Life and that is the only game they play. Their current computer is so crappy that the web browser lags. They can play SL at the lowest setting with getting 5-6 FPS in most cases.

I would honestly rather have a pre-built computer, as building a computer gives me a headache -_- but if it is insanely cheaper to build it myself, I will do that. Depending on how much the computer is, I may be willing to pay for not having the hassle of putting it all together.

I am not sure what specs would be required, but I would like the computer to be able to run SL at the highest possible settings with getting little-to-no lag. I know SL is laggy by default (I've logged on once or twice and I have a pretty decent computer and I still lagged a bit).

I am looking to spend $250-400 if possible. Honestly, it does not have to be able to run SL at max settings right off the bat. As long as it can run it on decent settings with no lag and has room for upgrades (new GPU and/or RAM or maybe even CPU in the future) it will be good.

So, recap:

• Needs to be able to run Second Life decently
• Needs to be in the $250-400 range
• Needs to have room for improvement/upgrades for the future
• Does not matter where it is ordered from as long as it is a reliable source

Thank you in advance!

http://www.newegg.com/Product/Produc...82E16883113223

It's refurbished but it's pretty much what you're looking for.

Ninjaedit: outside the upgrading-part. If that's a real necessity this would be better: http://www.newegg.com/Product/Produc...82E16883229362
It can be upgraded to another mid-end gpu without too much hassle.