HD 3000 works fine, I have that IGP also. If you do encounter the problem with this that the desktop randomly freezes for a second or two with a black screen, you can easily (and completely) fix this by adding a boot parameter to disable a feature that was enabled in recent kernels. I've detailed the few steps here: viewtopic.php?f=90&t=114306#p636391
. This will affect power usage a bit though, and will consume a little more power when the GPU is idle (i.e., when you're not doing anything).
I think the 320 GB HDD and 20 GB SSD will show as two hard disks. You could install Linux Mint to the SSD, and mount /home and swap on the HDD. Disregarding /home and swap, Linux Mint base install needs about 6 GiB of disk space and you aren't easily going to need more than 20 GiB on your root file system.
I've not found anything too helpful, but a quick search turned up this positive review: http://www.amazon.com/review/R3KIQM6Z23 ... deID=&tag=
. The Ubuntu 12.04 the reviewer refers to as not having the one issue discussed, that is what Linux Mint 13 is based on.
Sounds like a winner.