I’ve not played an Orange cab, but if you’re looking for a 2×12 there’s loads of options. I just got rid of a Gallien Krueger Neo 2×12 for an obscenely low price, and that dealt with 600w of power, and was a relatively easy lift.
If you’re looking for ‘proper’ lightweight, Barefaced Bass is worth a look. I played drums in a band with a chap who used an original 1×15 Barefaced Compact, and it was awesome – the newer version is a 1×12. The Barefaced Super12 is a 2×12 and will cope with 1200w of power.
I’ve heard very good thinks about TKS cabs – they’re built in Sweden, and their prices compare well with cabs in the UK. Not played one though.
Second the Basschat comment too.