Wow, since no one else helped out (watch you'll get flooded now). I don't have the P99. Never shot the P99. But I'll say this, with the exception of the P22 and the PK380, Walther makes really good handguns and I know a lot of people who swear by them. My friend carries a PPS in 9mm for his CC EDC. He even wrote a review that both Truth about guns and Walther USA picked up. Off track, sorry. Anyway, IMHO it seems like pretty much any well made modern pistol would be a fine option.
For pricing check gallery of guns, bud's guns, or grabagun. You should be able to find a reasonable idea of the going price. Sorry I couldn't be more help.