It's the least bugged Luger variation, so it's a good starting point. Better than jumping into fancier variation directly. e.g.
http://www.gunbroker.com/Auction/Vie...Item=146217737
Ammo is not cheap. But 9x19 new ammo is not cheap either these days.
http://www.a1ammo.com/products/fiocchi/f30l/