I just bought a k5 which will be one of the new MV lids, this has the integrated visor, acu gold and EC approval so can be used for trackdays etc...
The veloce is a really nice lid, very light and a very small shell basically a budget corsa/pista. The shells are oval so if you have a round head it wont fit.
I have an aria RX7 also but the agv is a some respects is a better lid, comfortable quitter and doesn't try and pull your head off.
I'm a bit disappointed with aria as they haven't changed the shell design for years the visor is a pain (even if you know how to get it off) and they don't perform that well in the crash tests. The only concession to unfaired bikes is a moulded spoiler on the Rebel.
The cost difference in the UK is in the import duty still no VAT on lids but .gov charge up to 44% on some items! so you cant compare quality with cost.