Part of that depends on how "handy" you are...
You could "convert" your 10 (I'd suggest starting with a bigger tank) into a S/F for relatively cheap, then spend your money on a beter skimmer, lights ,pumps, and HOB overflow...
Or you could buy that unit and have a "small" start...
Looking at the "dimentions" given...(14"x8"x20" ) thats only a 10 gallon tank ... (small)... and with that perspective...shows that skimmer is very small as well...
That size S/F on a 55 would be relatively innefficient (whether you built or bought) .
If you are "handy" and want to persue this, you may want to concider a 30 long tank, build your own "baffles" add a pump and HOB overflow, buy a "good" skimer, add lights and Macros to the fuge...
Along with adaquate LR in the tank and good flow (you may want to hang on to your powerheads untill you explore C/L systems) ...You would be able to get rid of the "filters" compleatly and move some of the other equipment out of your MT...