There is nothing uncertified which I have seen which gets anywhere near the comprehensive functionality of the G1000 - though I have not seen (with my own eyes) stuff available for the U.S. Experimental market, which I have seen in catalogues, and much of which is utterly impressive and at prices c. 1/5 of certified products.
However, as a visit to any European GA show shows, there is a lot of "glass panel" stuff out there, and some of it is very good - along the lines of the Avidyne product i.e. no integrated GPS or autopilots.
My 1948 Luscombe has a MAUW of 1400 lb
Yes Mike but you can hardly call that a tourer
Nobody denies that a lightweight plane can be built using WW1 technology. But you still end up with a very basic construction. Flying along and you feel the cold draught going up your leg from some orifice somewhere... Anybody can do 750kg or less if they make such compromises.