Re: Help!! 147 or GTV
Having one of each, I'd say you're simply not going to know until you've owned both.
They are very different generations and heritage, and it shows.
Personally, I prefer the GTV as it's a more involving drive. Especially in relatively empty rural roads. But on long motorway runs or congested computing roads, that quality becomes wearing quite quickly and the 147 becomes the better option.
Fuel costs aside (the 147 is diesel), I find the running costs similar because the GTV tends to be more reliable.
Dunno who's down your way, but I would invest in a check over by a specialist before purchase. As has been mentioned, they can be a money pit, and an experienced eye should help you step over it.