Which ones? I wanna try a GT 640 4GB out...high N factor might be big soon-ish (it already kinda is, with the upcoming scrypt asics).
I'm mining ultracoin at 415kh/s, you think MRC is a better choice?
a GT 640 4GB (Compute 3.0) should do 1.6 kHash/s for Yacoin and N-factor 14 coins.
I was recently able to get four cheap GT635 OEM cards with 1GB DDR5 memory (Compute 3.5) from ebay and with -L 2 they also manage respectable 1.3 kHash/s with very low power draw.
I currently have no idea about the exact profitability of various coins. I am a programmer, not a daytrader

Christian
No prob...was asking mainly from the performance standpoint :p
So, pretty low, seems like R7 240 4GB would be a better choice, unless you can get higher hash with higher L values.
Gonna have to test it myself

Edit: we need a compute 3.5 card with 4gb and gddr5 ram...maybe the new Maxwell cards, GT 750 and 750ti. hmmm