Welcome to the site, gotta say I'm jealous looking at that hardware list.
My main suggestion would be to max srv 2's RAM to the full 8GB and install ESXi. I run my home lab on a single box of similar specs and it handles my needs without issue.
Check through the forum archives on the site for past discussions on home lab setups, plenty of advice and good links to keep you going for a while. I also blog about my ongoing work with my lab, relevant posts can be found under the
lab tag.
Hope this helps.
Andrew