I like the way the basic mode works and gets straight to the point.
A few points that occur to me, but they're all just cosmetic things..... The slider for linux/windows could be a radio control, it would be more fitting for the options.
You can't tell what you're choosing with the CPU power slider, I'd put marker on the slider such as .25 .5 1 2 etc and label that as '* 1 Xeon E5520 etc'
Why are the bandwidth and subscription hidden in accordions? If it's just to keep the results table from being pushed too low you could recapture that space by removing the text from the dark blue gradient area, the second line is fairly redundant info and the "Cloud Computing Comparison Engine" could happily sit above the top menu almost flush with the top of the page.
When you expand the details for an item in the results list it's very difficult to read. As it is in an expanded element you can afford to get some extra white space in there. Pop a bit more of a margin round the tables, and add a bit of css so the column widths are the same for each result row, which will make it easier to compare details of results.