Damien,
I would absolutely agree with the Lencarta idea
Have you seen my "Absolute beginners guide to off camera flash/studio lighting"?
How big is your studio?
Having just built a studio I might have some ideas for making it cheaper for you
eg.... How wide is the area?....... 9 feet? then buy a 9 foot wide pole and then attach two thick pieces of wood to the walls maybe 8 inches side by 4 inches width and 1 inch thick. Cut a "V" shape in the top of the wood and then you can mount you pole straight across your rooms width...... Decent quality backdrop holder for under £10 and without taking up space with the stands.
eg2.... Buy a pair of Ikea Muslin curtains for £15 and machine them together, this gives you a backdrop 10 feet wide and 12 feet long with hooks at the top that go over your pole !!
So my idea of how to spend your money 
Lencarta 2 head starter kit -
LINK.
This is £269 so £19 over budget BUT it has decent lights which have a BOWENS S fit which means they take any standard BOWENS S fit accessories such as soft boxes etc.
The quality of the stands is EXCELLENT... I use these same stands with my Safari and ElitePro lights.
The kit comes with 2 umbrellas BUT you can swap one for a softbox like this:
A 2' square softbox is £54.95
but drop one reflector @ 19.95 and one umbrella @ 19.95
so swapping one umbrella for a softbox would cost you 54.95-19.95-19.95 = £15.05
This would make the new total = £269.95+15.05 = £285
You will not get a better setup for £285........
I would also ask them to swap the battery radio trigger set for a mains radio trigger set which will be a no cost option.
This is £35 over budget but will give you:
2 x SmartFlash 200 (200Ws) Flash Heads (FLA010)
2 x Studio Light Stands (STA009)
1 x Reflectors (MOD006)
1 x Silver reflective Umbrella (UMB003)
1 x 4 channel MAINS Radio trigger/receiver (TRI001) {after swap}
1 x 80cm 5-in-1 reflector set (REF001)
1 x 3-head carry case (BAG001)
1 x 60 x 60cm (23 x 24") Square Softbox (SOF004)
Top setup
