First, let me say I am not familiar with the tents you're comparing but, I'll put my 2 cents in anyway.

"The Copper Spur has a bigger footprint, is taller, has more vestibule area, packs smaller and is 13 oz. lighter. However, even at 50% off the Copper Spur ($240) is still almost double the price of the Stormbreak ($130)."

Don't go cheap! Take advantage of the sale price. Sounds like a no brainer to me.