I acctually like that Sephiroth sig you have . I know you never done that pic yourself......but who cares. Your sig just needs tidied up. I hate fat bold sigs that take ages to load on my uber powerful 56K modem complete with AOL they make FFR look untidy too.
1. Don't include any more than 1 logo (as the logo is just an advertisement add a text link instead)
2. Only 1 banner (in your case The white one looks better)
3. Do your text size 1 and in bold (it looks sweet)