I would go with an S480 or S484... that 66 will be able to feed a really big primary charger... you could even go with an S510 or bigger. People run the S480 with 62mm and 64mm chargers so I would go with an S484 or bigger, you gonna get a cam to help out with lag?
IMHO the 66 would be a little small. You could sell it and buy an S400 for around $1000 new, or you could find a used one for around $500. I know someone on here is selling an S474 for $500 and it was just rebuilt.
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