i'm guessing that you've got a local dealer nearby with one in stock?
I looked at the 3320 when my not-so-local-dealer Scamblers had a bunch of new JD's at good prices a few months ago. But the prices weren't quite good enough by the time I added a loader.
It's a strange marketplace. Round here real farmers use real tractors that need a ladder to get into and call 1,000 acres . This size of tractor is used by golf clubs and sold by groundcare dealers who don't really get farming. The next size down - the 3/5/700 ranges- are firmly aimed at the ride-on mower market. The lawn tractor title is a marketing thing, so these tend to be at the top end of the lawnmower dealer's market.
I tried finding out all about the 3320 online but it wasn't very rewarding. JD's site is abysmal, global and aimed at the heavy end. I never found a spec sheet for the loader. When you do find the page on the 3320 it's full of JargonTM crap. Maybe the brochure is better, and maybe the dealer really knows his stuff. It's heavy enough for the job and it has enough capacity on the back to lift a heavy pallet. On a US tractor forum no-one had anything much bad to say about it, or the small tractor ranges generally.
I have a JD X534 4 wheel steer mower with an 25hp engine but weighs only 350kg. The deck is 54" and is very solidly built, as is the whole thing. I've had it three years and the only trouble was when I put dirty fuel in. I use it for topping which is not it's intended use but it is very good at it. It has enough power to demolish quite thick nettle/thistle scrubby stuff most of the time so I think the 3320 with a 60" deck will be fine. I also tow a little trailer around the place and its great except that it's too light when the grass is wet. That said it makes minimal impact on the ground.
I also have a MF 1533 which I would guess is more comparable to the 3320. That, however, is really an Iseki painted red which to my mind is an advantage. Small tractors are serious business for Iseki while for MF they're a distraction. My experience which covers five tractors so is modest is
1. Turf tyres do no damage but are useless on slopes in the wet. Ag tyres rip the ground in all conditions, but R4s are a good compromise
2. Manufacturers and golf clubs love the hydrostatic transmissions for some reason. I don't: I don't find it intuitive and I don't know what it's doing so I prefer the shuttle manual gearbox, which is also vastly cheaper to repair. I also want to be able to switch between 2wd and 4wd so I know its slippy before I'm stuck
3. I prefer an open machine rather than a cab, but then I'm in the soft south. It's quieter and you can both see and hear what's happening far better
Hope it helps. Best of luck.