You made a good choice in the eight frame medium hive, much better than a TBH in my opinion. If you only wanted to keep some pollinators around and not make honey TBH are fine but if your interest is in honey production Langs are the way to go. TBHs can be fun to play with but they present their own problems when it comes to feeding and harvesting.
I agree with this. Top bar hives seem extremely hard to over winter in the northern states too.
We also buy most of our equipment as unless you have a lot of spare time and cheap lumber, you can buy it just as cheap. The high costs are usually the shipping costs. If you can get equipment locally that is great. Mann Lake has free shipping if you order over $100.
We just finished building and are now painting 6 new nucs to get ready for splitting and swarm season. So far all 19 of our hives made it through the winter and I think it is going to be a busy spring for us.