Thanks for all the quick responses - though not what I wanted to hear!!!

Just bought Antminer S1 for £250.  Currently mining at 0.007682/day, though there have been two v long blocks on Slush this week. With elec costs here in UK of £1/day I reckon that gives ROI of 154 days ignoring any increase in difficulty or change in £/BTC.

As you say, more entertaining than profit earning (and talking to a nice bunch of guys like you!).

But I still ask the question - what should I upgrade to , to make some money?  

Couldn't find any info (in English) on Xia-T-Hash!  Anyone any experience of Miners Cube?