Sir,
You having asked this question probably means that you can indeed afford it, although maint and fuel will probably piss you off depending on how much you can afford it if you get my meaning.
As far as storage is concerned if you want ski's or shovels or what-not, you can order a basket for any 350 without cheeks from DART in Canada.
It has a roomy cabin and everyone can see each other. Any 350 with a french engine will suck fuel HUGE! I don't know if they are certified in UK but the lycomings are quite efficient, and the newer 600-700 FX's are just as powerful as the B2 with less fuel burn and parts are cheaper.
The EC 120 is a great overall machine, faster than any 206 model, but power is an issue when trying to Vertical out of a spot anywhere near gross weight. It will vertical out if you have "quiet" hands but it Translates very poorly. VERY POORLY. The baggage compartment is a huge plus but you may or not have w+b issues if not paying attention. Spare parts for the VEMD are very hard to get, but for a low timer very easy to use pilot wise. Great safety characteristics, and easy on fuel, and alot faster than a 206 or 206 L. Do a W+B and you can even take out the aft cargo door to haul longer cargo.
An L4 will serve you very well and considerably cheaper than a 407. Both can vertical out quite well. Obviously the 407 quite faster. You should be able to get a basket for the 407 as well.
As far as maintenance is concerned make sure you find out who services which machines in your area. Go talk to some of their private clients and see how things measure up. Also take into account how many hours you will be flying in any given period. If you take this under consideration it can possibly relieve you of any worries regarding support issues timewise.
Lastly, if you are buying a Eurocopter they may be able to serve you better if you buy in to a maintenance program. Not enough room here but you should ask. It will make some of your more expensive components a little easier to handle should you have issues while sucking a little more out of you for each hour flown.
Good luck sir.
PS
Can you afford a Pilot LOL