I would agree bigger is good, but do not take this the wrong way i would not go bigger than 750 at your age man... and size.. CB750, look at some of the CB650's even the 500's rip! have you thought about re gearing your 350? if you do not ride a ton of HWY i would def recomend dropping a tooth in front will really wake it up!
Only reason i say do not go bigger than 750 is they get heavy after that, slow moving it aroudn the garage and shiz one misplacd foot and it leans wrong she is gonna go... plus more CC tends to be more power and you will get dumb... trust me i have been there... wait till you get a few more years under you belt on the road and build up to the 900's +... again blake not trying to slam ya at all bud, just wish i would have done it that way when i was younger... i jumped right into sport bikes... then went bigger and bigger... till i got dumb... 650's and 750s are awesome platforms and after you want more UMPH out of it, you can play wiht motor mods, and gearing and what not to get more fun out of it
have you thought about keeping the 350 and maybe going cruiser or something you can pop a lady on the back to scoot? I know when i was younger i had to sell one to get another one but not sure where you at on that... if you can pull it off the honda shadow 750 spirits are WICKED bikes man
really dig how your 350 came out!