What an interesting idea for a poll - the Pollbringer has struck gold with this one!
It's got to be the blue one for me.
Being of frugal mind it's always a pain when I see something (e.g. a Beastmen Vanguard box) but it's just too much money to spend at once (no thanks whatsoever to GW for their continual price increases

). Taking the blue pill would mean I could pick up anything I fancy for my armies with a clear conscience (except for the concern that getting things free of charge would deprive independent retailers of financial support... but if the rule was that somehow through the pill's powers they'd get magically-conjured money for the things anyway then my mind would be at peace once again).
As for the other pills, the red one would be second (it would satisfy my perfectionism if I could absolutely nail all my painting, but my practical and non-perfectionistic side is fine with the battle-ready paint jobs I already give to my models). However if the red one had been 'lightning-fast painting skills' instead I would have been a lot more tempted by this one, painting is easily my least favourite side of the hobby and it'd please me immensely to be able to get paint jobs equally as good as my current efforts done a whole lot quicker.
The purple one would be third - with my gaming circle still being quite limited at the moment an extra opponent would always be welcome, though given Mr. Cavill only seems to play 40K it would do nothing to help increase my Warhammer Fantasy and SPQR gaming groups. Not to mention it'll likely be difficult trying to convince him to choose 5th and 6th over the current inferior versions of the game which seem to be what he's chosen to play.
The gold/yellow one would be dead last, I am grateful to already have been blessed with a sharp memory and I already know certainly the 5th/6th 40K and 7th/8th Fantasy and SPQR rules off by heart (and it certainly won't be much of an extra step to learn TOW). Though this of course may change as I get older - when I'm triple my current age it's likely this pill will become a lot more appealing!
@NIGHTBRINGER I'm surprised you've gone for the red pill, your paint jobs are already excellent - indeed very much like me I think you'd benefit a lot more from a 'lightning-fast painting skills' pill instead.