[W/A Golems] help

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So, I have two decks that I use to casually play with at my local game store here in SD and I need help figuring out what needs to be changed in one of them. I should note that I do not have anything before coreM12 to play with at the moment.

Haven't played since sixth and my card list will consist of things from:
· Magic the Gathering 2012 Core
· Scars of Mirrodin
· Mirrodin Besieged
New Phyrexia

Issues are as follows:

· Should I switch back to W/G/Artifact for more production?
· Which Rares/U/C should I be keeping an eye out for from the most recent sets to help boost this deck?
· To Conversion Chamber or not to Conversion Chamber?
· Major inconsistancies drawing first hand + first 5 turns are 50% failhard. (Managed to beat a Tooth and Nail deck before however.)

Mana ·
22 Plains (My non-basics aren't that great. Think the best one is Ghost Quarter besides the duals.)

Creatures ·
4 Ardent Recruit
4 Gold Myr
2 Blade Splicer
4 Master Splicer
4 Sensor Splicer
2 Precursor Golem

Other Spells ·
2 Lifelink
3 Journey to Nowhere
2 Pacifism
3 Mighty Leap
1 Angel's Feather + 1 Golem's Heart
1 Nevermore
3 War Report
1 Decimator Web
1 Prototype Portal
1 Mirrorworks

Thoughts? Suggestions?