I have gone BMW and I thought I would share my experience so far...
Personally I'm using a BMW E34 (5 series) as my donor and I will be using the whole rear subframe - narrowed slightly to fit inside the chassis.
As far as the front hubs are concerned they are not really suitable but I am going to perservere with them anyway and engineer my way around the problem like any proper stubborn bloke.
I have also considered using sierra parts to make life easier but I'm not sure the diff will take the 220bhp and bags of torque from my V8.
I hinsight, and E36 beemer would have made a lot more sense and made life easier but the 5 series just came up at the right time at the right price.
have a look at my build diary at:
www.samsv8locost.blogspot.com