Green Ramp Suggestions

http://www.mtgvault.com/ViewDeck.aspx?DeckID=353505

That's the deck. I've played it against my playgroup maybe 45 times in some version or the other, and I've finally think I'm getting somewhere. My group LOVES removal to a fault, so there's a bit more of a premium on hexproof than I might do at a FNM. Budget is also an issue.

So, what do you guys think? The things I'd like to upgrade (but can't seem to find a decent option financially) are the Slagwurms and probably the Steel Hellkite. Other than that, within reason I don't know of many better options. Suggestions? Thanks!

EDIT: changed link I hope that works.