Hillebergs have a very high reputation and also a very high price to match. For the price of a Hilleberg you could have just about any tent on the market, or 2 or 3 good quality cheaper tents.
You could, but of course you can only use one at once...
I'm not sure whether you need to spend that much money.
You pretty much categorically don't need to, but that doesn't mean you'll regret it if you do.
Are you intending to backpack your tent?
Or otherwise move it around the wild? I must admit I'd only get a Hillie purely for formal campgrounds if I'd just won the lottery.
The Vaude design has the poles clipped on the outside. So you should be able to pitch it quite quickly but it probably won't have the highest stability. Tents where the poles attach to the inner, or are fed through sleeves, will probably take longer to pitch but may be more stable.
Though one needs to draw a distinction between stability in terms of small movements and stability in terms of falling down. External clips may affect the former but not significantly the latter, assuming the design's done properly (and I think VauDe know what they're at).
Tunnel tents are quicker to pitch than geodetics as you don't have so many poles.
If all else is equal, but all else may not be. I'd be very surprised if I could pitch a 3 pole Lightwave t2xt as fast as my 4 pole Tarra, for example.
Although the concept of pitching outer first or all in one is preferable in a rainy climate it is not that big a deal. So I wouldn't rule out a tent that is otherwise suitable merely because it pitches inner first.
I'd agree it's not a deal breaker, but there's more to it than just keeping the inner dry pitching. For me, a far more useful point is the ability to take down part or all of the inner and get extra space to invite your pals over for tea without getting everything mucky, or have undercover garage space to work on a bike or unload a boat, sort out wet gear etc. You can't do that if the inner has to stand up for your tent to be in place. Lots of people do without that, but I suspect a case of not missing what you don't have.
Now, where to find someone neot too far where I can see one. Bolton area - manchester/preston.Liverpool.
Drop Alpenstock (Stockport) a line. They're a main Hillie dealer and also have (or at least had) as good a price as you'll find.
Pete.