Do yourself a favor and buy a Nitrox compatible computer, not strictly an air computer. You may not dive Nitrox now, but you probably will want to in the future. If you have an air only computer, and you want to take advantage of the longer NDL's with Nitrox, you will have to buy another computer that is Nitrox compatible or dive tables.
Having said that, I have an Aladin Smart Pro and it's a great computer. I only have a few dives on it, but have found it to be very easy to understand, gives all the info I need and then some, and the deco info it gives has been right in line with my Nitek 3 and the Navy tables. The Smart Pro and Smart Com also have adjustable "Level Stop" settings, which will prompt you to make "Level Stops"(Sort of decompression stops, but level stops are not required - just advisory) to help prevent DCS.
Mike