I like the group buy idea more than the competition, because
1.The competition will only run for 1 month, and I dont think the rise in price would be sustainable for the long run.
   The big miners will be here only for price money and they will be dumping their PMCs as soon as the competition is over.
2. The group buy will be supported by people who actually care about PMC, which will be good for the coin in the long run.

I think we need the OP or someone with technical knowledge in the community to think about introducing POS into PMC as kbf mentioned earlier.
POS is the buzz word now and we should try to cash on it. It also conveys the message that the active PMC community is not reluctant to introduce new features and capabilities as required.
As a side effect, it increases security too.