Discover- 1K limit, 1% CashBack, Discover Deskshop (extremely handy), No Annual Fee
Associates Visa- recently increased to $1250, No Annual Fee, nothing else special about the card
Ive got both because Discover has a lot of benefits but is not as widely accepted as Visa is.
BTW, if you ask your CC company for a credit increase and they deny it, does it lower your credit rating? Discover hasnt given me an increase since I got the card last April, and Ive always paid in full, in time every month. Visa, however, has given me 2 increases within the past 9 months, from $800 when I got it, to $1250 now.