If you are looking for "bass but not too much bass", then i'd suggest skipping the subwoofer entirely and going with a 2.0 system instead. Yes, it is possible to simply dial down the subwoofer as most have bass controls, but all 2.1 sets tend to be balanced in such a way that the sound will become very treble heavy if you dial down the subwoofer too much.
The AV40's as you pointed out are an excellent choice.