RE: build from plans
Build from plans is a really big step for a beginner, as are mid and low wing aircraft.
You might consider building a kit, the Sig Kavalier is a really good flying airplane. It is a semisymetrical shoulder wing so it fly's similar to a trainer, with better speed and aerobatics but manageable. It also lands smoother than a trainer. The Sig kits are craftsman kits so there is some shaping to do, and this will help you to transition to plans building.
If you are set on plans, you may want to check out the ugly sticks.