A couple of ideas:
1) Flip the PSU so that it intakes air from inside the case. You won't have to worry about clearance off the carpet, and it won't make any difference to PSU temps (unless you've got a GTX580 or similar in there).
The temps may not differ much, but I would think that the PSU fan would work a little harder to cool the PSU using internal air. I may also explore using the bottom mounted intake fan.
2) For aesthetics as well as raising the case further off the floor, install some Lian Li casters? Did that with my P182, and although there aren't any bottom intake vents to take advantage of, it looks awesome. It raises the case off the floor by 2" / 50mm.
That looks nice, but I have no need for the wheels themselves on a microATX case. It also looks like it requires drilling eight holes, which I'd rather avoid.