The S-7 is a fantastic plane. My current is my second.
A good expectation for cruise is 100mph at 4.2-4.5 gph with the Rotax 912S. You can pitch your prop more for cruise and maybe make 110, or burn more fuel, but I think it's pretty much a 100mph airplane.
It's a 1000-1200hr build, give or take a couple hundred hrs. You can buy the quickbuild (covered and even painted already), which will knock a good chunk off.
Don't have any experience with the Jabiru, but can tell you that I love the Rotax. It's a great motor, and they just upped the TBO to 2000hrs. It's efficient, smooth, and reliable. Burns no oil. Pretty much maintenance free for the most part, and burns premium autogas.
Ed Snyder at Sport Planes Unlimited in AZ has built a number of S-7's and -6's with Jabirus and would suggest talkig to him.
[email protected]Also as courierguy demonstrates so well, its a great STOL plane. It won't haul what a supercub will, but it is a performer. You don't see many for sale, because I think most folks don't want to let go of them!
I am sure courierguy will also weigh in - another repeat offender - he's built 2 of them!
Some pics of my plane