I've tried a lot of different manufacturers over the years, but after working through the last of my old blades and needing to replenish my stock I've gone back to Bosch. From ebay they're a bit cheaper than from the likes of Screwfix and Toolstation.
The Milwaukee "Wrecker" range are about the best multi purpose demolition blades I've used, and seem to last considerably longer than Dewalt's and Saxton's equivilant, but for £4 per blade they should do! Saxton's timber and green wood blades are quite thin and bendy, and I feel they don't keep an edge as well as I'd like.