If I wanted simple I wouldn't have researched and picked out my Audio Research SP8 ver5 preamp with it's multiple regulated power supplys. Talk about complex, but it all part of what makes that preamp so good.
Want a great power supply on the cheap? Ebay is full of high quality used laboratory power supply's such as Power Designs, Lamda, etc. Fully adjustable, and some have voltage stability down into the microvolt range.
BillWojo