I am just getting into cyclying and I really love it. I ride 20-30 miles 3-4 times per week and I trying to build up to my first century. I bought a hybrid and really like it, but now I wish I had bought a touing bike. What should I look for to meet these conditions:
1) Lots of hills (Mammoth Cave National Park).
2) Clydesdale at 250ish 5' 11" (I just lost 110.1 lbs WHO HOO).
3) Single income (teacher salary) family of four (two toddlers) i.e. not a lot of money to spend.
4) I know nothing about building a bike.

What should I look for? Is building a bike something I should look into? I really like the LHT from what I have read, but alas a complete one is way out of my price range right now. I appreciate any help out there.