I'm sitting on a cruise boat chair while cruising down the Nile back to Luxor.
Doesn't get better than that.
Whatever you do, don't buy one from argos, mine fell to pieces when I was sat on it. Leant to the side, screw sheared and the armrest fell off, then tilted back and one of the legs snapped off.
a £500 black Kab Seating Director http://www.kabseating.com/office/product.asp?product=77 since i'm at work.
designed to be sat on 24/7 (which it is) so even after 3 years its still hideously comfortable. You get what you pay for when it comes to arse support i've found over the years.
A sofa...
I'm currently sat on a Klappe chair from Ikea,
One similair to Danm54's in the pic above, iirc it cost about £20.00 from tesco's.