Fortunately, there are quite a number of dive computers on the market which are great for both beginners and established divers, and which are available for less than $500. The Suunto Zoop and the Aqualung i300 are two that come to mind (mainly because I have used both at different times), on the less expensive end, but there are a number of others, as I said. Your profile suggest you are in Va Beach, so you might stop by Lynnhaven Dive Center (a Scubapro dealer) and see what they have. There are several models of the Gallileo that you might look at, although they move your outlay toward the upper end of your stated price range. Also, the Aladdin falls into your price and specification range. I am not 'pushing' these only giving examples as food for thought. There are also a number of other dive shops in the Norfolk - Va Beach area that you can visit to get information.