Um yeah, wood floor+concrete do not=long term investment.
Stained concrete is a good option, and a bit cheaper than hardwood in this situation. You will raise your floor 2 1/4" if installing hardwood. I would just go the epoxy floor coating myself. Or just commercial grade 'glue down' carpet on the cheap. Spend your money on bass traps. Don't cut corners to have pretty stuff.
PC Win7-64-24G i7-4790k/Cubase 8 Pro 64-bit/2-Steinberg UR824's/KRK G2-8/Event TR8/SS Trigger Plat Deluxe/Melodyne 4 Studio/Other things that don't mean anything if a client shows up not knowing what it wants.