depends on how bad your current wheels are. If they are steel (check with a refrigerator magnet and see if it sticks) replace them with those ebay wheels. If they aren't steel and they aren't bent up or anything I'd just keep em and put the money towards new tires, or brake pads, or a saddle.

That said, those wheels are a very good deal.

regarding tubes, you can get away with the Wal-Fart tubes for 8 bux just fine. Those 30 dollar triathlon shop tubes are probably presta valve anyway which your current wheels aren't drilled for.