budget?
2.0, 2.1, 5.1?
size limitations?
do they need to be "pc" speakers?
---
a decent pair of bookshelf speakers from the hifi/home theater field will push a fair bit of bass even without a subwoofer. with a hifi subwoofer you can really feel the low end if you picked the right sub.
most pc speakers only get "boomy" from the sub which is generally not very "punchy" and sounds bloated when compared with "good" quality low end from higher end equipment.
given that, much depends on budget and your expectations.