quick help please

http://www.gumtree.com/p/for-sale/synth-nord-rack-2-nord-lead-rack/1003376169

should i buy this?

I think that's an average to high price for that unit. A brand new nord rack 2x has a street price around £550 I think?

Looks like street price for the 2X is a bit higher. If you really want a nord rack 2 right now, go get it. I'm not sure how well you know the nords? They sounds quite brittle and digital, but they're nice, playable and very hands on. Lots of usefull sounds to get out of them, but if you're looking for a fat analog monster, they will do you no good.