@natasjlp wrote:my balances are very low - I am always somewhere between 1% and 9%.
ok, I understand about not needing high CLs for a high FICO but won't it matter when I try to buy a house and need a mortgage? will the lender take into consideration my CLs?
and really either way I would like to have high CLs for 'just in case'.
Oddly, some mortgage lenders have been known to gripe about people having too high CL's on their CC's, or at least some have said so here. Don't know how true that is. At any rate, you have good CL's on three of the four cards you have, and you have low util, so you are showing that you are able to manage revolving credit, which of course is the ticking time bomb of personal credit.
Who or what is Citizens? Local bank or CU, maybe? That might be part of the issue, that they just don't do super-high CL's. So three out of four of your cards are in the mid-four digits, which is good.
I'm guessing that Belden's is also a store-only card? If so, you might --repeat, might --benefit by having one more bank card, to total three. BofA traditionally gave better CL's than many of the big-boy banks, but I don't know if they still do. If US Bank is in your state, that might be another option.
But depending on your timeline for a mortgage app, you might not want to do any more apping. The belief is that mortgage lenders get antsy if you've acquired new credit in the six months or so before going for a house. They want to see that you are managing your revolving credit without drama, which makes them feel better about something big like a mortgage.
I'd do some reading around on the Mortgages board, or start a thread there asking if two bank cards and two store cards with a combined CL of not-quite $17K would pose a problem. And you might want to diplomatically ask if people are responding from their own personal experience. 
A lot of myths get created in forums (and everywhere else) from someone declaring thus-and-so, and then it gets repeated until it is taken as fact.