Classic and OneStar are certainly my top picks when it comes to sub-$20 plastics (though I’ve yet to try a Surge or Flipside).
The Adegle PSG and Asteroid are decent for their price.
Any specific reason why you’re looking for a bunch of cheapies. Normally it’s better to pool your money and buy a more expensive yoyo, quality over quantity.
I second the whip, and I recently picked up a flipside while traveling; it’s a fun little guy! I’m going to try to throw some synergy caps in it when we go back home!
How is the Crossfire? And the WHiP is actually really, really good. Way better than the PGM in my opinion. The WHiP and ONE are some of my favorite plastics, more then the Classic, PSG, even the Northstar. The Alpha Crash is good, and the Velocity and Speed Dial are fun yoyos. Too bad they changed the shape of the Velocity in the new version, I liked the old shape.