You know, I am quite new to all this really.. but I am just suggesting what I am using currently that is working for me.
But, the Reptisun 10.0 I would think can be used in conjunction with the Powersun... I think, I have heard of people using to UVB bulbs before. I had actually, and WILL be when I get a new bulb for my T5HO be using both the Powersun and Reptisun together.
But for a basking spot bulb for heat and just plain ole' light, you can get a clear bulb for the heat. I hear they work great, and are VERY cheap.