Well... If you're really looking at buying 6-8 combo's heres a list with some explanations... may put you in the right direction, but others will be along with their advice.
1. (1 or 2) 7' med fast spinning rod - dragging tubes, dropshotting, light jigs, etc
2. (1 or 2) 6' 6'' or 7' med hvy fast spinning rod - jerk baits, light cranks, topwater poppers, heavier tubes,jigging spoons, etc
3. (1 or 2) 7' med heavy moderate baitcast rod - crank baits, spinnerbaits
4. 7' - 7'6'' heavy fast baitcast rod - flipping and pitching
5. 7' med heavy fast baitcast rod - misc rod - heavier cranks, spinnerbaits, topwater,carolina rigs, etc...
Just an idea of what you might want to consider. As for brands, there's lots of good stuff out there. Personally, I mainly use crucial rods with stradic spinning reels and revo baitcast reels and have been happy with them.