I'm just in the process of building my own darkroom, and i'm looking for an enlarger and this is one that i have found

so firstly i'm assuming that the enlarger is the c7700 MX. As the title on ebay says only c770. http://cgi.ebay.co.uk/ws/eBayISAPI.d...id=p2759.l1259

But i was wondering what people's experiences are of this enlarger and is it worth buying and also is it easy to find lens to fit it or will 80mm be big enough if i want to print 6x7 neagtives say. I'm just a bit confused as i don't really understand this enlarger stuff as i just use the ones at school for 35mm and don't have to mess around with lens etc.

Thanks for any replies Shakey.