Then might I suggest Trillian? You can amalgamate several chat clients into the window and configure them to look essentially exactly as you want. As an example here are two chat windows from MSN and Skype on my computer:
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As you can see I have an MSN and Skype conversation open here, and its nice, neat and tidy.
Been using Trillian for a year or two now. If you don't pay for it, you do get the occasional advert, but I just added a keyword block rule in my router for /ad/v2/win/ and that stopped the ads.