Sly Fox used it a few times back when they were doing their IPA project of single hopped beers. Read a few of the reviews to get an idea about its aroma/flavor characteristics.
http://www.ratebeer.com/beer/sly-fox-galena-ipa/49755/
If it was an all grain recipe I probably would've used Munich malt as a base malt making it much maltier. As an extract beer there really isn't a good substitute for it unless you can get Munich LME. Amber DME never ferments out fully and leaves beers too sweet for my palate.
You are correct...
What kind of amber are you shooting for on this? If you are going for the west coast style of hoppy red you could try something like this:
7lbs Light DME
1lb 60L Crystal
.5lb 120L Crystal
2oz Chocolate Malt
1oz Centennial 60min
1oz Centennial 15min
1oz Cascade 10min
1oz Cascade @...