i cant honestly tell much difference bewteen the bases..unless you go the ashoka route and add margerine,coconut etc..
as countless people here have reiterated time and time again,a base is just a building block for the final curry...provided you dont over/under do the spices,use the standard combination of carrots/celerystick/pepper/garlic/ginger/onions/some toms,i really dont see how you can go wrong ??.
personally,ive tried most of them,and theyre all fine..some slightly different than the others,but ive pretty much stuck with the Dipura method for a while now...using a minimum of water in the boiling/steaming stage,then adding a lot just before blending...only thing i do different is continue to cook the blending gravy for quite a while after this,as i do find this makes a differnce.