You're right...$600 Beans is too much...I may just go Akro and call it.
If you can hang on a bit longer there should be a lot more choices out there.
I'll throw this one out there again. It will be available for the R3 in a few months or so.
I was seriously impressed with the quality of these. They ship from Denver, CO.
Delkevic (Dell' Kuh Vitch) verified to me via email that they WILL be making several different slip-on exhausts for the R3.
They just have to find an R3 to borrow to do development on, so it will probably take a few months or more.
These should start in the sub $200 U.S. range (actually c. $160.00 for polished aluminum) and go up to around $275 U.S. (for Tri-oval shaped carbon)
They are a British company with a regional office in Colorado, U.S.A.
I have their DS70 Carbon on my CB500X and it's great. Very lightweight, has removable DB killer baffle and took all of about 15 minutes to install, including removal of the stock muffler.
I would say the quality is comparable to the high end products out there like Akrapovic, Two Brothers and Yoshimura, etc. at 1/2 to 1/3 the cost. Unlike these brands, with the Delkevic you can tailor the sound to your liking with the removable baffle.