Welcome to Geekhack!

Are you looking to stick to the TKL form factor or want to try something new like a 60%?
If you want to try out some switches, you could get a
CM Storm Mechanical Key Switch Demo Board since it has Red, Black, Brown, Green, Blue, and Clear. Use the spring from a red/blue/brown in a clear and the you have an ergo clear!
I personally use lubed browns, vintage browns, and 55g ergo clears.
Clears do have a more noticeable bump but are a bit heavy for me so I did a spring swap to 55g springs for all keys except Esc (I usually pound this hard

)), Space Bar, and the stabilized keys (Left Shift, Right Shift, Back Space, and Enter).
I can't comment on Topre since I have yet to venture down that path.