I've got the 2013 Spark 920 and I think it's a great bike. That being said I think the Fox rear shock is worth going for the 2014 930. The groupset is not much between the two - I was looking between the 930 and 920 for 2013 and only chose the 920 because I wanted Shimano SLX/XT over SRAM X7/X9 as I preferred the shift action on the Shimano kit and the paint job on the 920. Faced with the same choice for 2014 I would probably go to the 930.
You will surely notice the diff between a 2010 Spark 60 (I went from a 2009 Scale 50) to a 2013/2014. Carbon front, better rear suspension set up, twinloc (best part of the bike IMHO), better wheels, better everything.
Good luck with your decision...
Oh and to complicate things - I am thinking of getting a 2014 Genius 710... but not just yet.
A forum community dedicated to Mountain Bike owners and enthusiasts. Come join the discussion about bike parts, components, deals, performance, modifications, classifieds, trails, troubleshooting, maintenance, and more!