Won 2 standard tournies with this deck so far, cant wait to get the thing fully done

For anyone interested, here's the link to his deck:

http://deckbox.org/sets/402945

That aside, I would suggest you look at the Naya Blitz decklist that is currently doing well in most of the big standard tourneys (pro tour, GPs, etc) as you're not THAT far off from it and I think it'll add a little bit more power behind what you're running.

Agreewith Ty 100%

Even then though there are changes you might consider. I think I like boros Elite instead of the cackler, it can still pump champ and be the 3/3 on turn 3 you need to put the hurt on.

Reckoner is a solid card, but have you considered frontline medic? He's the 3/3 for 3 and easier to cast. He also pumps parish and provides some solid abilities.

That all said, really adding green is the way to go, it gives you another play off burning tree in the form of mayor, which is pretty brutal play in that deck. It does make it a lot more $$ expensive deck though the lands are very necessary for the deck to be consistent and you really really want cavern of souls if you can get them.