most off road lights are about 100 watts. either halogen, sealed beam, hid, etc., depending on your budget. 2 on the roll bar is a good start til you figure out whether or not you need more. round, square, or rectangular is purely a personal choice. a second set on a bull/push bar in front would be a good idea as well. the ones on top will be reaching way out there and the ones on the bar will get you lots of light closer up. which brand depends on your budget. big name brands are usually way more than the chinese knock-offs on ebay. you tend to get what you pay for, but you might do fine with the ones on Harbor Freight, Northern Tool, etc.
a pair of 55 watt fog lights, mounted low on the bumper, or close to that, will do you well. i wouldn't go too cheap on fog lights as those can be critical in heavy fog and you'll be using them on the highway as well. again, clear or yellow is a personal choice. i prefer yellow and mine does well here in northeastern Minn. with lots of fog from Lake Superior.
i'm not big on "driving lights" as most people don't aim them correctly and everyone else gets blinded by them. if you just up grade your headlights with some of the advanced halogen bulbs, the aim will be the same, just brighter light on the road. better and safer idea really.
for all your added lights, make sure you use heavy gauge wiring, 12ga at least, relays, fuses, wire covers, and really good grounds to your frame.
there are lots of good threads here as well as good write-ups in the tech library on this site. just my $.02.
ps. if your budget is real tight and you really need some off-road lights, i'll send you a pair i took off that are from Harbor Freight just for the shipping. look on their web site,
http://www.harborfreight.com/automo...-road-long-range-truck-light-system-3029.html and if you think they would work for you, just pm me. don't have the wires, switch, relay etc. but you can get those at the local parts store cheap enough.