SDHC memory card for A2000IS

I just bought canon A2000IS and would like to buy a memory card. I feel that SDHC card is better then SD card.If yes then which brand' card is best suitable with this camera. I would also want to know the class(2 or 4 or 6) and capacity(4gb or 8gb or more) of the card best suits though the canon claims that it supports the 32 gb of SDHC card.
The best suitable memory card to capture stills and movies as well?

Well, you want the fastest card you can afford. And I'd stick with major brands like Sandisk. But if you're taking mostly still images, you don't need to obsess over size. In fact, I still use 2GB cards and have yet to fill them once. Why use smaller cards? Simple. INSURANCE. Any memory card can fail or become corrupted. And when you're on vacation the last thing you want is to lose the opportunity to take pictures until you can recover that media card with a software utility. If your card goes bad, swapping another one for it at that moment is of advantage so you can keep taking pics. Then, later when you're in front of your PC, you can use a utility like "F-Recovery" to get back your pictures and recover your card.

No need to lose the moment because you relied on one card one when several can solve that problem. At the very least, you want to get more than one of whatever size you settle on.

whats the highest class recommended? I can only find a 4class, is that fast enough for my a2000is? I think i have seen class 6. Is that over kill for my a2000 is?

I personally think a class 4 is more than enough for the A2000. Once you get into incredibly advanced (and expensive) mem cards, they are beyond the capabilities of the camera and just don't make any difference in performance.