There's only a few direct routes I know:

$33r 3x-turbo
$55r 2x-turbo
$100r
Steps
$700
weekend 30k FPP (you can satellite into the 30k)
There's also a Mega FPP satellite

Obviously biased, but the $700 seem to be the best way. You can easily spend $700 in a $33r if you don't know how to play them. All the rebuys are pretty high variance. I would go for the $700 and the FPP routes (Mega should be more difficult as you have to win a few stages) if possible.

I am only guessing, but I think this might be the last Sunday for the $700 as there are no others listed now and it's getting closer to the date of the event. I think that's your best bet, followed by the $50r.

Yeah, I agree, and I think this Sunday is the final one.