Core2duo, 2ghz, 2gb RAM.
http://www.ciao.co.uk/Fujitsu_Siemen..._1536__6558041
Fine with FL Studio, Reason etc, but took a bit of tweaking with Traktor 3. That seems to be the application rather than the laptop tho.
I think I overpaid to be honest (£800) but with those specs it will still be a good machine in a year or two, so won't need to replace for a while =)