Mike,
Your equipment sounds like it works for you (at the moment anyways till you get the urge to upgrade). I always think if it works for you and your happy with it leave it alone - people will always try to sell you something but if you don't need it spend your $ elsewhere. My suggestion is rather then putting the money into equipment put it into the room itself
Look at some sound treatments and things of that nature I think you'll see a much better improvement for you $$ then adding equipment. Regarding power filters and such unless you have power issues I don't think they are a requirement. Any basic UPS or powerbar from APC or Belkin will likely be all you need.
Put up a couple of pics when you get a chance and a few more people will likely give your their thoughts (tougher with out images of the room etc..)
Good luck.
Calvin
Your equipment sounds like it works for you (at the moment anyways till you get the urge to upgrade). I always think if it works for you and your happy with it leave it alone - people will always try to sell you something but if you don't need it spend your $ elsewhere. My suggestion is rather then putting the money into equipment put it into the room itself

Put up a couple of pics when you get a chance and a few more people will likely give your their thoughts (tougher with out images of the room etc..)
Good luck.
Calvin