The marshall mcb cabs seem great value for money! Not sure of the quality though, as it seems too good to be true for the price...
I have always used Ashdown cabs before and they have been very realiable for years, the only reason im changing from these cabs is because I fancy a 6x10 cab and one of the speakers in ashdown mag 4x10 is starting to buzz a bit after 5 years of hard gigging .
I am going to be ordering my new Warwick WCA Pro 611 cab next week.
Possible option for you...? Can get them for around £579 brand new, or around £300 second hand on ebay!
Bit more moveable than the 8x10 as well!