RP is definetly cool. I am a little jealous
I couldn't say which would be better. I'd imagine you would know what size shafts you would be using that year, so the hub might not be that beneficial. I would say that 7075 is a little overkill though (and a little pricey too!) 6061 is plenty strong enough. I don't think any of the teams who have used those wheels have ever bent them.
__________________
-Travis Covington
2008-2017 - Engineering Mentor of
Team 254
2001-2008 - Engineering Mentor of
Team 968
1998-2001 - Mechanical Director/Driver/Member of
Team 115