I heard the bad comments about the Avmap too. I actually spent months trying to contact the manufacturer, with extremely limited success.
I was after a "VFR GPS" to use as a backup for all my other (panel mounted) stuff, but in the end I went for the LS800 tablet computer (out of manufacture now so should appear on Ebay at reasonable prices), a remotely mounted Emtac bluetooth GPS, and running Memory Map / Oziexplorer. The end result is arguably better than any portable GPS currently on the market - you get a perfectly readable version of the actual printed chart.
FliteMap still appears supported by Jepp (with website updates) and anyway it is merely FliteStar with NMEA GPS input, but I don't think you can buy it anymore. I was advised by Jepp in 2005 they stopped selling it. The reason was never given (and the decision did not make much sense) but I suspect they found a subtle bug in it. I was once flying off Greece, on the way to Crete, and found FM reporting me about 2nm off position. Reloading the program fixed the problem, but I never fully trusted it afterwards. Very shortly after that, Jepp posted a 9.15 update on their website. I never saw the problem again, but I have also not used FM as a moving map since about 2006. I use it for ground based IFR flight planning, on a laptop.