That case you posted may or may not work. Full suspension bikes sometimes break down small enough to fit in them, but sometimes they don't. You won't know unless you get one and try it, and you won't find a cheaper PRACTICAL option than the S&S case. I searched this one pretty hard awhile back, and the expense is justified since it maximizes the 62" rule as much as possible for bike specific packing.
Delta's fees suck. I fly other airlines if I'm traveling with a bike.
You should consider shipping it if you can get an address from the promoter. I do it about half the time I travel. When I do ship it I pack it in cardboard since the hard cases weigh a ton, and UNFORTUNATELY most cases DO NOT fit within the CURRENT UPS/FedEx standards for Dimensional Weight.
http://www.ups.com/content/us/en/resources/prepare/dim_weight.html
That Performance Team case is outside the limits by a few inches, so they stick it in your ass with extra fees. Trust me.