First off, WELCOME!
469's are interesting guns but to me they always seemed a little off balance.... others think they are just right....
469's will use any 5900 Series magazines for increased capacity so you're not stuck with the 12 rounders..... A US Customs pal of mine used to carry his 469 with the 12 rounder in it and his reload mags were regular 15 rounders.
The discontinued Marlin Camp Carbine 9mm uses the same mags for a little extra flexibility....
$269 isn't too bad a price for a good example if it hasn't been roughed up or altered.