If your looking for aluminum find a taiwanese manufacturer or just buy used. China is not known for high quality aluminum. Also the carbon frames are excellent quality do don't be scared.
LightCarbon.com
Yinshun bikes... same company as lightcarbon they make high quality stuff might be the best in the game right now
Promance - the most bought xc full suspension m78007ii
Edge design international - uci approved frames paint ready to go only issue 120 days shipping
Carbona - linked to planetx and thesis
All these companies are excellent options for carbon if you want to get allout I recommend contacting Kenstone Taiwan they make the bikes for kona and might be able to give you a sample... FYI taiwanese companies can be hard to connect with.
If you need help getting a frame please send me a message with budget and type of bike your wanting.