I’d personally go with the Goblin EVO. It’s cheaper to begin with, has the 120mm fork you’re looking for, and a similar level of components, plus it’s available and is shipped to you. You won’t have to worry about a 500 mile drive!
I can’t tell you how high you just got my hopes…They’re still sold out of the 18 inch. They’re even sold out of the 20 inch. I would’ve ordered it already. I have found the Diamondback that I could order from a distance but wouldn’t be able to test ride it first. I know the 2016 models are coming out soon. Maybe I’ll just wait for them. I hate to lose an entire summer of riding though.