With hindsight I'v learned the best advice is get the biggest one you can afford. Weight isn't an issue as you don't carry them, they have wheels!!!!
As long as its low enough entry and has a large, flat rubber lift pad. http://www.amazon.co.uk/Lightweight-..._sim_sbs_kh_16
I bought a 1.5 tonne originally (the same one you linked to JonD, also badged Draper and Clarke) but it felt like it was going to snap or bend at times, really struggled to lift half a 1700kg car (850kg) so god knows how it would deal with 1500kg!
I've now got a 2.5 tonne large size one (permanent loan from the Father in law
) absolute dream, sure its heavier, but much easier to lift the car and rock solid stable.
The smaller ones have a very small footprint which doesn't feel very stable.