i have never seen a high gloss/gloss nickel finish on a CZ. however, CZ does offer anniversary issues so i wouldnt be surprised if they did you a gloss nickel. the nickel ive seen have been mat/satin. and the one you have shown looks like a mat/satin.
to me, on the outisde, it looks fine, but i would have to disassmeble the gun to see what ware, if any, is on the gun.
if the seller is truthful about the round count, i wouldnt worry since all of CZs guns are test fired and as such, will have some rounds thru them.
if you have the owner look near the ejection port, there is an oval above the extractor with a year code.
you can find manuals from CZs web site. you can download them.
afa price goes, who knows what good. for me and down here, it appears high. you are in Canada and i know that prices are different then down here. you could look at your gun auction/selling sites and see what they go for. also some sites have past/old sales so you could search there too.