If price is your guidelines then go with the charger I recommended to you awhile back, it only costs $29.

[link]http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXL331&P=7[/link]

I have three of these and I use them every time I charge my planes. If you are charging Ni-Cads or Ni-MH batteries all you need to know is the capacity of the battery. This battery has 4 outlets on them with selectable output. You don't need a peak charger that costs a lot of money right now. For instance, if you have a 2500 Mah battery you can select the 250 Mah output and the battery should be fully charged in 10 hours. It's very difficult to overchard Ni-MHs or Ni-Cads so you really don't need to worry about leaving the battery on for too long. While this isn't the most fancy charger out there, it gets the job done and will do more than one battery at a time. Plus it doesn't break the piggy bank. I've been using these for years now and I've never showed up to the field with a battery that wasn't charged yet.

Ken