good idea m8, i got a beast of an angle grinder, but ad reckon about the 10" one would be an all rounder.do you have a compressor etc? as some of the air tools are great.i think getting the right attachments for the Dremel would be the way ahead for the nooks n crannies, getting the edges straight is a pain especially around the lettering.
these are the attachments i was on about last night got them off Ebay, to prolong the discs i would use better glue as the adhesive isn't too good
greaseless does take time and can be a royal pain,as you said you need to be getting your times down with out sacrificing quality.let me know how you get on at the Range with the angle grinder.
lata mate
Bri