Are you expecting any amount of Trinistax in your area once Darksteel becomes legal?
I'd hope so, it happens today...
They become legal in Constructed on the following days:
• Mirrodin October 20, 2003
• Darksteel February 20, 2004
• Fifth Dawn June 20, 2004
Bam. I'd say Trinisphere over Pyrostatic Pillar, I'd rather that my opponents cheap spells cost more (because you've got the mana base/acceleration to cover it), than to take damage from playing my own Moxen and Welders. If your environment is mostly unpowered, Trinisphere and Chalice of the Void should push your opponents' plays up a full turn, buying you the time to set up the Fatty rush.
Bosh is decent for the Fling, but I'd run a second Trisk...valuable removal ability versus other Welders, not to mention man-lands or any SuiBlack creatures. I personally run 2 Karn's, and 2 Solemn Simulacrums, 3 Su-chi, 2 Triskelion, 1 Platinmum Angel, 4 Juggernauts...if that's not enough beef to get the job done, you need to seriously examine your meta.
And my solution to Landstill is to run Stifle sideboard, with Tropicals main...of course there's low Misdirection in my area, so I run the Ancestral/Timewalk also. And "sub-optimal" Wonder...yeah, I like my creatures to have an evasion ability, I'm weak like that.