I have currently a warrior 600w amp (2x300) and a pair of skytec 250w disco speakers.
I am thinking of getting another pair of speakers to increase my volume for the slightly larger venues when i am doing my mobile work. The only thing is i don't know what might be best to get, another set of disco speakers or go for a pair of bass bins or is there anything else out there.
Two constraints, i haven't got a load of cash to spend on them and the smaller they are the better as i haven't got a load of space left in my transportation.
Any thoughts will be very helpful and could sway me one way or the other.

I can currently offer you a pair of Idex V-15 (Ohm Manufactured) 15" 200 Watt Rms Cabs for £149 + delivery for the pair. They are excellent speakers but being 15" Cabs not especially compact.

Chris, in your personal opinion is it better to have a pair of bass bins instead of another pair of disco speakers or doesn't it make any great difference.
Are bass bins generally more expensive than general disco speakers??

What are others people's views...

I personally have a couple of IMG Stageline 650w speakers, plus two Peavey 300w bassbins..

And I never (well very rarely) take the bass bins out with me... The 650s output enough clear sound, including bass..

So I personally would buy a couple more of them, or similar...

Just my choice tho...