I like the plans you have for this car hope it all happens for you. If you have the budget to do the rear it will always help. The only advice i could give you with the back is not to go to a vented rotor in the stock width, they are to thin to be using a vented rotor and do have a tendency to warp i have Znoelli s12 slotted rotors and ferrodo XL pads allround on my EF xr6 and i have not got brake fade yet. they wine like crazy under heavy breaking though
. I know alot of people won't agree with me but i pronally think the DBA rotors are crap they are too soft and i know a few people who they have warped on, could not tell you if DBA have fixed the problem yet. If you didn't want to go to New Zealand to buy rotors (Zonelli) i would get RDA rotors. Znoelli rotors are worth thr extra money though and they are not on every man and his dogs car
http://www.znoelli.co.nz/Discs_Sport.htm
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EF XR6 Manual 271RWHP/199RWKW N/A using Stock manifold with dual plane runners still operating. EFI Hardware 6TBM to come mid year.