Just heard that Sam Adams Octoberfest and Sierra Nevada Octoberfest (gets great reviews) are showing up on the shelves.
I need to try more of the Octoberfests this year - the SN is on my list. It's almost time to bust out the Pumkings from last year from the cellar!
Here's a partial try list for you (in addition to the two you mentioned):
Brooklyn Oktoberfest
New Glarus Staghorn Oktoberfest
Flying Dog Dogtoberfest
Left Hand Oktoberfest
Victory Festbier
Half Acre Lager Town
Bruery Autumn Maple
Breckenridge Brewery Autumn Ale
Southern Tier Harvest (more of an English Bitter)
DuClaw Mad Bishop
That's not even venturing into the pumpkin offerings.