$8+1 - about 3 or 4 times a day. I play the 21.45 every day until I qualify for the weekly final.
$70+7 - daily at 19.45. (except for Wednesday)
$625+25 - evey Wednesday at 19.45
I think it caters for a variety of bankrolls whilst giving all a good chance at qualification.
I start from the $8 cos it's easy to get thru. Plus, I have too much time on my hands.

If you can't bear to do too much grinding, then $650 isn't too bad if you're desperate for one last shot.