Huh, Suzukers seems to be making some competent bikes for a good price these days. Are you hunting a new or used bike? I like Sport touring too with a favor torward sport. The problem with touring with a smaller displacement bike is you have to work the tranny and upper RPMs alot more. The smaller inline 4s are describeds as being buzzy on the highway and the seating positions are cramped. The 650 SV looks like a good comprimise but I dont know anything about the bike. I have and will never get rid of my VFR 750. Its a V 4 and makes loads of bottom end power right off idel and just pulles harder and harder as the RPMS go up. The bike is very comfortable and handels like a sport bike. I do lots of 2 up riding with it. It has 50 K miles on the stock motor. I love the fact that I dont have to rev the poo out of it to make nice easy power. Under normal driving conditions I usally skip a gear or two when shifting up cause I can go form 8K to 3K with nice traffic excelleration. So, my vote is for a used VFR 750. They made em from 86 to like 98 or so and went to the EFI VFR 800 after that. New ones are still great bikes but they go for like 8000 or so I think. I have had my 86 since 95 and I paid $2500 for it :) . The 86 to 88 were the fastest and lightest. I dont know the stats on the new one. If you look at older ones make sure its a VFR 700, 750R and not a VF 700, 750F interceptor,,, big differance.
Good luck bro, keep the rubber side down :) .