Thanks so much guys, this is such valuable feedback and it's really informing my choice. I am going to really miss yaw on twist I think.. and I don't want to splash out for pedals right away. Now you've all got me thinking that perhaps I'll use a two stick system and use my old stick for yaw and maybe vertical/lateral, alternating my left hand between the stick and the new throttle. Anyone tried this kind of set up?
You could think about the progression I took, which was firstly Hotas-X (as others have said, great value for £30).
I then saw a new,
stick only warthog for iirc £135. I'd been fretting over whether I could justify £250-£280 to myself, and this seemed a good halfway house. I've seen the stick alone going that cheap a few other times on amazon as well. According to camelx3 cheapest ever was £114, though not been very low since Oct last year so you might have to wait a bit. £185 at the moment on Amazon, £155 on Alza according to google (never heard of Alza though!)
Anyway, for a long while I used the Hotas-X throttle and the wathog stick, with the hotas stick behind the monitor out of the way. I used the analog rocker switch on the Hotas X for yaw, and I got used to that a lot quicker than I thought I would. ED copes really well with >1 type of controller, the only problem is that it just labels them as e.g. Joy 1 in the settings, with no way to tell whether Joy 1 means button 1 on the Hotas or button 1 on the warthog. Not the end of the world.
Apparently in the US you can get the warthog throttle separately, but I've never seen it for sale over here. The only other throttle only option I found was the CH throttle which I bought a couple of months ago. The only real reason for that was there wasn't quite enough buttons on the Hotas-X throttle. I missed the rocker axis, but the CH throttle's got a little analogue mouse stick I'm using for yaw. It needs a fairly big dead zone set on that little stick (it'ss not settling back dead centre), but i find it good enough for yaw. I'm no ace pilot though and not into PvP. Again, no problems mixing that with the warthog stick.
Edit: to answer you original point, the warthog stick is great. As others have said, it can easily double up as a blunt weapon if you want, but the buttons and overall quality is top notch as well. Mine is not entirely smooth with a
little freeplay in the centre, or more accurately a slightly lower resistance for the first fraction of movement before the full resistance of the spring kicks in. No problems with accuracy though and I don't think I've set any deadzone up at all.