My 2001 GTV V6 with 53k miles is having the oil cooler replaced today. The pipes all rust through at about that age. Steel pipes bolted to alloy rad so they corrode & the rad threads strip when you try to dismantle. However, some have managed to remove them by cutting the nuts with a dremmel.
Also having front wishbones replaced for second(!) time. The bushes and balljoints have about the same lifespan so replacing the bushes with powerflex ain't worth it as the balljoints will be shot and can't be replaced separately. Standard wishbones are cheap (by Alfa standard...).
However, rear powerflexes are essential - mine were needed at about 30k but should now outlast the car. Only other tip I have on that is that APPARENTLY the V6's rear rose joints don't need to be replaced, so only 5 bushes a side needed over the TS's 7, but others have disagreed with this ...
Have had to replace both window mechanisms. Expensive, about £500 each
Fortunately ALL of the above has been covered by my warranty from Warranty Direct who, uniquely I think, cover wear and tear items. Expensive premium, now about £700, but so far more than paid for itself, but cover reduces after 60k.
Other tip is if clutch is particularly heavy this is a sign of wear and must be replaced quickly to avoid damaging the flywheel, which is, of course, pricey ...
Engine is undoubtably magnificent but I was surprised that in standard form it is almost disappointingly quiet. Will get a BMC CDA intake & straight through rear exhaust section when funds allow, just to hear it! Can get 25-27mpg with regular open road use - but can be less!
Prices are so low you must get one. V6 is v different beast to TS. Get an enthusiast owned one who is aware/has fixed all the above.
And go to sportsalfa.com. No offence to AO but you'll find answers to all GTV specific matters there.