Selecting a new skimmer

[guzzlo]

Hey fellow reefers! I am in the market for a new skimmer, trying to not spend a fortune. My current tank is composed of 150 gallons of water stocked heavily as a mixed reef. In the near future I would like to setup something with a total volume of 300-400 gallons. Just wondering if there is a decent skimmer that I can buy now that will also be able to handle the job in a bigger tank without way overskimming my current setup. My current skimmer is an old bubble magus on a modded rio 2100 pump. I was looking at some of the internal reef octopus skimmers, any help or points in the right direction would be great.

 

[Reefing Madness]

Reef Octopus XP 3000INT
SWC 300
Reef Octopus SRO5000SSS