Your warm side is a tad cooler than most use. Perhaps, this explains why I see my BP's hang out on the cool side almost exclusively except for a couple days after feeding. I maintain 88-90 degrees F on the warm hide side and 80-82 on the cool side.
Pretty sure I have heard of some people keeping an ambient overall of somewhere around 85-ish with no cool or hot spot successfully. That may or may not work well, I am just uncomfortable using it myself particularly with my snakes seeming to prefer the cooler side by and large.
EDIT: Also, you really should check out Cornel's World for the RHP's(not positive but, I think he sells Reptile Basics RHP's) they run from 28 watt to 160 watt there and when combined with proportional thermostats such as some Vivarium Electronics or Herpstats the burn risk should be significantly reduced as the RHP doesn't run at full power to attain a higher heat.
His FAQ's may be helpful in making your choice.
http://www.cornelsworld.com/accessor...eat-panels-faq
Good luck and you will love having an X-PVC set-up I'm sure.