5.cz = $50 to $125 = Reseller Value Speculation (NOT an end user speculation)
Mvy.cc = $5 to $20 = Reseller Value Speculation (NOT an end user speculation)
I don't know Czech market, but single-character domains are universally sought after, definitely worth more than "$50 to $125" in resale. mvy.cc valuation seems accurate, though.
However I wonder if you actually own 5.cz and where did you acquire it?
5.cz = $50 to $125 = Reseller Value Speculation (NOT an end user speculation)
Mvy.cc = $5 to $20 = Reseller Value Speculation (NOT an end user speculation)