A lot also depends on the sculptor in question. AB are hardest to paint because of the temptation to go into fine detail on every figure, but they wash just as well as anybody else's. Probably the best examples of good figures for washing are the impending Napoleonic ranges from Blue Moon. Not as finely detailed as AB, but more deeply sculpted with exaggerated relief on cross belts and the like. I need to finish my Russian division and their early Russian types will do the job nicely - as well as being less than half the price of AB's range.
Now then, I bought some Dark Tone Army Painter and it's pretty much like my own oil paint formula, except mine doesn't cost 17 quid. I've done some figures in this (but I let it down to minimise the staining on raised surfaces and improve its lining qualities) and some in my old stuff for comparison. posted below. I have to confess that I sometimes do a little highlighting, but I tend to keep this to a minimum with units just to save time.
Oh yeah, while I'm at it, I bought some Coat d'Arms supposedly 'dried earth' shade basetex stuff a couple of weeks ago and it was a disaster. Coverage is crap and it dries with a distinctly green hue. I had to over-paint the whole bloody lot - not impressed. You can get the original Basetex stuff from Trevor Holland at Coritani (nice bloke), but I think I'll stick to my tried and trusted sharp sand over PVA. It takes a little longer to finish the bases, but at least you can control the colours.