An interesting dilemna. I suspect from your comments that what "makes you shout" is the low end torque/momentum that is the hallmark of long stroke high mass flywheel engines : Your Bonne is void n this department because it is actually a modern "oversquare' high revving engine, which means it doesn't hit its stride until much higher up the rev curve, and then with less sense of visceral "grunt". You could capture that with the Kawasaki W650 or W800 (brand spanking new) and still have the Bonne twin format with high speed performance superior to either type of Enfield So if you want higher speed performance with the punch you like, that is the bike . More $. As far as the choice between Enfields, frankly taste is highly subjective. I personally far prefer the G 5 to the C 5 from a visual styling point of view, and if you are planning any off/rough road , the 19 inch wheels are an asset in this regard. Performance and maintenance wise , either in UCE format is well ahead of what you now have, . I cannot comment on the "thump" but if that is a dealbreaker, there are aftermarket exhausts to fix it and enhance performance a bit. With currently availabel aftermarket mods (filters Power Commander, , low resistance exhaust) it seems likely that you can squeek another 20% performance in hp out of the UCE without loss of low end. And the internal mods are just starting , but from all the discussion groups I follow, if you really want to do it up, I don't think 40 hp is out of reach with internal engine mods that may become available (piston kits, cams, possible oversize cylinder barrels etc) In other words, the UCE is a work in progress, so buying one doesn't marry you to the current performance profile. Check out the newly announced "Bullet Black 500' just announced in New York....same great UCE engine disc brakes etc with a Bullet 350 body style and a small cost advantage too:Tons of aftermarket parts cheap And look at the girders that support the fenders: You could carry a lot of stuff on that rig mate. happy choosing Nigel Canadas