Hi Fog..
I Bought a SWB 2.0i Petrol Leaf sprung off ebay at the beginning of the month, and havnt looked back!
Good price with plenty of reciepts, never off roaded (until the 25th that was

) and with Gregsters magic tyres (again, thanks for the lend

) it performed faultlessly off road with absolutely no mods at all, it would beat my old Series 3a 88" landy hands down - for ability and comfort - its got a heater for starters:D.
Averaging 30mpg if my calcs and Odometer are right
http://www.fuel-economy.co.uk/calc.shtml"Your real-world MPG average is 29.11, covering 514 miles using 17.66 gallons of fuel." - and that includes playing in 4L up and down hill and dale on the 25th.
IMO -
If its a weekend toy SWB, if its a day to day - LWB. Fuel / engine choice - Cant say, but The 8v 2.0 petrol is cheap to fix, reasonably simple to work on and its a proven engine (astra, cavalier etc), and if the turbo goes pop on a oil burner... £££££££ kerrrr-chingggg ££££££
SWB -
Good points - agile, better turning circle than my Mk5 Golf! Ecomomical, cheap to run, insure & fix, loads of front and rear leg room, roof and windows out in 5 mins, roof off in 30 mins, enough power from the 2.0 for playing in mud.
Bad Points - Tiny boot (4 carrier bags small), blind spots due to door pillars, more power would be nice, lack of aftermarket bits (compared to Landrover / Suzuki etc)
Is it fun? - ask my Step-daughter

Good luck and I hope this helps
John