depends on how badly you want an mp5 clone as a plinker. personally, i agree with most of the suggestions so far to get the saiga. more uses, pretty good quality, and rather fun too. gsg mags are expensive too.
you know, i think gsgs are gonna sell pretty well for the next year at least, with all the youtube videos of people having fun with them. so you could buy one, play with it for a few weeks or months and then sell/trade for the saiga.when you can't have both, have one and then the other! haha