I have had a gsx1100et, a gsx1100esd and gsx1100ef.
All 3 of them put a smile on my face.
That said... I have the best memories of my 1135 with rs36. Could just manage 160km of range due to the fun factor.
But...
It al depends on your goals. Commuting, street, street/race or pure race. .. Turbo, Nos.. Etc... Most go faster goodies can still be had for both the 1100 or 1135.
Gszone.biz has a nice collection to swiftly max out your credit cards