I'll let someone from Kitfox answer the question as to whether they plan to do an SLSA in the future or not, but if you buy a flying Kitfox, which will almost certainly be an E-AB (Experimental - Amatuer Built) then you can do all the maintenance yourself. The ONLY thing you can't do is your annual Condition Inspection, but if you know an A&P with IA you can probably do most of it and pay them to sign it off.

If you buy an ELSA kit or SLSA bird you can also do the maintenance but only after taking and passing the 16 hour course.

Since you won't be building yourself (you sure?) the big decision you'll need to make is whether to buy an EAB or SLSA with the big factor being the medical requirement for the two different sets of pilot priveledges... Sport Pilot vs. Private Pilot.