Joe....do what ever you come across a good deal on. A6's are cheap , z6's are getting pricey these days , and a fucking d15b is just rediculous.
If it was me though , i would get a a6 , put some ZC pistons in it and do a OEM parts rebuild , and rock it . That is IF i did a single cam.
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RIP Kevin Gonzales AKA Slo_Si 9/06
RIP Robert Kolp aka 00ek 4/07
RIP Pablo Garcia aka FatHead 9/07
_Jake D