as many have said, you want the skeletal structure of your bike to be solid. to me, that is frame, forks, cranks, pedal axels, things that are going to bear the brunt of weight transfer in tricks...all should be full chromoly; the sealed hubs and bottom bracket would be next for smooth ride and endurance of those parts themselves. Double walled wheels would be next.
For me, anything after the things mentioned above is just "eye candy"...
to add to the Mongoose mode 900 and that SE bike that sounds awesome, I would also check out the Hoffman 'Bama complete. The skeletal structure is all chromolly. Other parts could be replaced as you need. I almost considered this bike, but then decided to wait and spend more money and go all out with a Verde Luxe
I've Got sXe!!!
Up The Antix/Up The Punx
1988 Mongoose Caifornian Pro
2015 Surly Krampus
"Running Is dumb" - Dave Lawrence