Several good condition 30k KM RC51s -
Aprilia RSV 1000 R (Factory?)
Ducati 848 / Evo S
Lastly: Multiple 03-09 liter bike options favoring the R1 & 1000rr for dirt cheap 3
My $0.02 based on personal experience and opinions.
RC51. Given some of the things youve ridden, you might feel likeit doesnt live up to the picture you have in your head. SOunds like you like some reasonably mileage, and parts availability could be an issue for ongoing routine maintenance.
Aprilia, not my taste personally, cant offer much here.
Ducati 848. Kinda the poor mans version of the bigger brother. Didnt excite me hugely. nice bike, bit of fun, but go to a trackday for example, and youre gonna find you lack a bit of the raw grunt you say you like.
K5/6 gsxr good, solid all round bikes. good balance of handling / power / size etc. A bit beige as far as sports bikes go, IMO.
Litre options. S1000rr, My personal take of this bike was that its f*ckin easy to ride fast, but it does so with such an inherently german efficiency, that it became a bit less exciting to ride for me, felt like the bike was doing all the work, and I never felt like *I* had acheived something, as much as the bike did. Loads of raw power, surprisingly light handling, feels small to sit on. apart from the fact that I didnt develop an emotional feeling for it, it was a great bike.
R1s. 03-09 covers four generations. 03 last of the 5pw model. decent bike, but IMO pales compared to several of the other options.
04-06 R1 is awesome looking, great all round bike, first of the undertail exhaust R1's. good balance, Id say medium sized for a sprtsbike, FEELS smaller than the GSXR's to sit on, but more power.
07-08 R1, I currently have one of these and i freaking LOVE IT. its has the best brakes and suspension of any R1 (pre 2015 upgrades) the most raw power of any R1 (again, pre 2015) and is an absoltue screamer. Exceptionally well balanced, loads of grunt. Fancy parts are hard to find, its the R1 model with the least availability of aftermarket stuff, as it was only a 2 year production run, and literally everything on it is different from the previous, and successive generations.
09 R1, first of the crossplanes, they are deceptive to ride, open the throttle, feel a bit excited, look down, and realise youre going a hell of a lot faster tha you realised. unique engine sounds, and power delivery. LOADS of aftermarket stuff available, being early Versions of the crossplane theyre a bit cheaper now. One of my favourite bikes.
By the RC51, ride it for 6 months to tick it off your bucket list, then sell it and get a 09-12 R1.