prices have risen alot in the last year - not necessarily because they're worth more! Begining of 2007 £50k would have got you in to some golf or beach developments around Tangier. £100k would have got you into Marrakesh - both new build off plans. Resales are cheaper.
I think now you'd probably need £80k Tangiers and £120k in Marrakesh. This probably isnt the very cheapest, but I would be very careful if looking at that end of the market.