I think you should go with the 250r. It's lighter in both weight (333lbs vs. 393lbs) and price ($3,499 vs. $6,499US and $4,249 vs. $8,199CA). I have read many good reviews of the new 250r by experienced riders who have loved it. One of the things many have said is that it is funner to ride a less powerful bike near its limits than to take it easy on a very powerful bike.
From your previous posts, it seems the only reason you would go with the 650r over the 250r is because of that magic 650cc number. At this point, with your experience, I don't think you will take advantage of that extra 400cc the 650r offers. The styling of the 250r and 650r are similar, but personally, I like the new 250r better. The rear seat cowl, subframe, and front fender look more like the bigger SuperSport bikes. Also, I think you would be much more comfortable pushing the 250r around in the garage.
From what you have written here, I get the impression that you will change bikes quite often during the course of your riding career. That's certainly not a bad thing, but that also makes me want to suggest that you get the 250r because you will end up getting a bigger bike in a couple of years anyway. In that case, why not go for the cheaper, lighter, and easier to handle bike now. You may even find that the 250r is the perfect bike for you; if not, I think the 250r holds its value better than the 650r.
DID I MENTION THAT THE 250r IS $4,000 LESS THAN THE 650r!?!? ($3000US) (sorry, I really felt the urge to yell that
)
P.S. If you do get your new bike lowered, change/modify the side stand to make it lean correctly.