Personally, I would make sure that everything that exits the panel is jacketed cable, no single-conductor wiring. Route it away from heat sources and use tie-wraps. Then there won't really be any need for conduit.
Here is an older picture of my system to give you an idea of what I am talking about.
"I brew with a water cooler and some part from the toilet." - JohnnyO
"I do gravity feed the last gallon or two through my Therminator, but I expect you could suck start a Volkswagen before you could suck start one of these. - GilaMinumBeer
"..... Bull was right." - TXCurtis