I don't agree that all good music speakers make good HT speakers. Some speakers are awesome for music but come from having precise imaging that make for a sensation sweet spot and crap everywhere else. For HT, on the other hand, imaging is less important and in fact you sometimes want an almost diffuse sound coming from all five channels.
I agree with Mac's recommendation to look into NHT and PSB. These companies are both excellent performers for their price ranges. Unless their models have changed recently, the PSBs tend toward a little bright while NHTs tend toward dark (with the exception of a couple models). NHTs seem to have better, tighter bass, almost across the board which of course makes me a fan of them. I also think "dark" is not so bad for HT application because of aforementioned imaging being less important to me.
A more important aspect of shopping for HT speakers to me is to get five of the exact same drivers. Many "HT systems" make compromises in the rear and center channel while delivering two good drivers for the fronts. In home theater application, up to 90% of the information passed through the center channel--it is by far the most important aspect of HT speakers. Some people have the misconception that center channel is "only for words" but in addition to being responsible for nearly all of the dialog, the center channel also has music, special effects and nearly anything else in the other channels--especially in a good surround mix. Matching the front and center drivers will give you an even pan across the front field and make the film seem mroe realistic. Matching the rear drivers as well will special effects to sound "correct" as things move overhead or behind you.
While I personally am a big fan of tower speakers, I'd remind you that HT soundtracks are designed with a low frequency effects channel in mind and because of this a subwoofer or "bass module" is not so bad as it is in music application. Since your budget is limited, you may try to find five identical speakers that you like now used and then add a subwoofer a little bit later. Super Ones and PSB Alphas tend to go for a good price online and both mate well with subwoofers.
Just my two cents.