I too, thought there was NO way I was spending THAT kind of money on 1 powerhead. I mean how much better can they be? It's a powerhead, afterall!
Well, I used 3 Koralias and it was ok, but really hard to find the spot where no coral was getting blasted but everything was getting good flow. When I upgraded my tank, I put a closed loop in. I thought I would not need anything else with this! WRONG! So, I bit the bullet and bought an MP20 tp supplement (not even the 40, just the 20 for a 5 foot tank) Put it on the end and EVRYTHING is getting random, wide, beautiful flow. It simply ROCKS!
Like it was said, buy cheap, buy twice. You simply can't beat the Vortech. You may seriously want to give it some thought. Look for a slightly used one, or a new one someone doesn't want at a slight discount and no tax.
Good luck!