A CZ 97? Win.
Regarding the original two choices; wouldn't say either was at a good price. I got my East German Makarov for under $300 not 2 years ago, and a Russian double stack for $200 more recently. For a commercial Russian, I wouldn't go over $250, and that's if you HAD to have a Mak.
CZ 52 with 7.62 and 9mm barrels; $450? No, too much. The 7.62 Tokarevs and CZ 52's were great bargains at under $200 and when the surplus ammo cost about the same as 22lr today; but the surplus ammo is gone. 7.62 now costs more than 9mm, if you can find it. Shooting 9x19 out of it makes the gun a bit more economic, but at $450, you're going to find a lot better 9mms out there. Someone mentioned going up a hundred for a new CZ 75B; hell, you could go DOWN a hundred and grab a used CZ 75 off gunbroker right now.
If you have to have the 7.62/9mm combo package, you'd do better to search for a Chinese Tok, and look for the alternate barrel.
BTW, yes, the standard issue mags for 7.62 will feed 9mm fine, for both the Tokarev and the CZ.