Skimmer help

So I was thinking I need to upgrade my skimmer. I believe it is a ER CS6-2. It worked good on my old 75. However now I've upgraded to a 125 + ~100 gallon sump. I'm hoping to keep a well stocked sps/mixed tank in the future. Currently i only have a few fish and few smaller corals. I have a couple of options:

-keep my ER CS6-2

-a new octupus recirc150 or recirc200 http://octopusskimmer.com/

-a used MRC MR-3R with iwaki 100 for $300 http://reefcentral.com/forums/showthread.php?s=&postid=8471284#post8471284

-hold out and wait to upgrade when my tank is more stocked

-try and get a different used skimmer (recommendations?)
 
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