I know it's been awhile since the OP asked about the "best/cheapest tent", but I think the question is worth looking at again.
I'm only going to consider cuben fiber because this is an Ultralight backpacking site.
We all know there's no such thing as the perfect tent, everything is a compromise. Yet when you average everything out (weight, cost, storm worthiness, useable space) the Hexamid is still the best UL solo tent on the market.
Simplicity is good. The Hexamid setup is so quick and easy. It's not the absolute most wind worthy shelter, but it's pretty darn solid.
People have complained forever about the full netting floor. All I do is just place a 1 oz piece of polycro underneath and that cures everything. It keeps dirt/mud/grit out of the netting and protects it from abrasion.
I like the removable floor because I can use it as a groundsheet whenever I want to cowboy camp. Can't do that with a regular tent floor.
And the weight CANNOT BE BEAT. The cuben Cricket is close, but you're dealing with a solo innernet and that means small constricting space. The Cricket also costs about $70 more.
The Skyscape X is $115 more, and by the time you add the second pole you're looking at 4 oz heavier than the Hexamid.
The Solplex costs $85 more, and just like the X, you'll need another pole. It's also not as easy to set up. Better in the rain though.
The worst thing about the Hexamid is the low entryway. You definitely have to crawl to get in and out.
THE BEST UL SOLO TENT? That's the most elemental question in UL backpacking. I know it's been argued to death, and it's a matter of taste, but for those of us under 6 feet tall, the simple solution is still the best. Hard to beat the original Hexamid.