I've been told that I can use a Mini Display Port to DVI adaptor with the thunderbolt port then just a HDMI to DVI in the HDMI port, is that possible?
That's what I do with a 2010 Mini (MDP instead of TB).
Yes, it works perfectly.
The tricky part comes if you want THREE monitors. For that, you need to be sure to buy the video-boosted Mini model that has AGP graphics, or use a (slow) USB video adapter for the third screen. But for two, any modern Mini is fine out of the box.