URI are decent bulbs(altho, i like ATI the best). I have an 8 bulb setup on my 120G, and Its really gonna depend on your tastes. I played around with many different bulbs/placements. On my tank I have.
front
URI superactinic
ATI Blueplus
GE day or Geismann Midday(6000k or 6500K)
ATI aquablue
ATI Blueplus
URI Aquasun (pinkish tint)
GE day or Geismann Midday(6000k or 6500K)
URI superactinic
back
its really all personal preference for the look you are shooting for.
I really like these bulbs
ATI blueplus (better than Giessman actinic+ imo)
ATI aquablue
URI Superactinic (better than Gies pure actinic imo)
GE day 6000k (i like slightly better than Giess midday imo)
URI aquasun (pinkish tint) (instead of 2 aquablues, i prefer 1 ATI aquablue+1 URI aquasun)
I had to play with about 3 different configurations, and bulb placements(placement is critical) to achieve what I was looking for. Also, 8 bulbs is alot of light. You'll be suprised. I was. Right now I actually run 6 most of the time, and turn the other 2 on for 1/2 of my light cycle. And it is only actinic/blueplus.
in short, I would recommend
2 ati blueplus
1 ati aquablue
1 uri aquasun
2 GE day, or geis midday
2 uri superactinic
and play with different configs. But once again, its all up to personal preference, if you want more blue, add more blueplus or move more towards the front, or if you want more white, add more aquablue or move to the front, or nuetral(slight yellowish tint) move GE day more towards front or possibly use GE 3000k in place of 1 GE day.
good luck,hope this helps.
-Mike