Dude, if you are serious about the hobby (serious, meaning, "I DIG this, and am not going to give it up anytime soon") then get yourself a decent charger. You're using NiMhs now, but if you really dig this hobby, you're going to go brushless and Lipo eventually. If you got this charger, you would have the only charger you'll probably ever need. Charges ALL types of batteries. You'll be much happier with one of those than the cheapo trickle chargers.

When you DO go Lipo, just be sure to read up on the "care and feeding" of Lipo packs. They're just a little different than NiMhs.