that's a lot of bass. you need more than just tweeters. you need full range speakers to reproduce between 60Hz and 20,000Hz. The subs just do 20Hz - 80Hz.
most people with that much bass will run a pair of 6.5" component speakers in each door (two pair total). this requires some fabrication to fit both 6.5's in the door. the tweeters work well in the apillars. that is a tried and true method.
first, no one can recommend speakers without knowing the following:
1. what vehicle/make/mode/trim/etc.?
2. what are your factory speaker sizes and depths? (
Crutchfield and ModifiedLife.com and MetraOnline.com are all good references for sizes and depths)
3. what is your speaker budget? - try to spend as much on speakers as you did on subs - seriously
4. where will you be shopping? (local shop, online w/ warranty, online w/out warranty)
5. who will be installing them?