New tank, filtration suggestions appreciated

Hi all. It's been a long time since I've been here. (I accidently spam blocked
the list). Anyway, my DH bought me a 150g for my birthday, and I have no idea
how to filter it. I've had some suggestions, and it's kind of 50-50 over
wet/dry systems and canisters. The tank will hold 6 fancies (orandas, moor,
ryukins, eggfish). The orandas are large, and one ryukin is about the size of
the palm of my hand. All of my tanks are crystal clear with large oxygen
levels, all have Penguins or AquaClears, so I'm not too familiar with the
canisters. I've looked at the Eheim 2028, and it's looking not too bad, but
what are the pros and cons of each? I already know that the filter media for
the penguins is costly, is a canister more cost efficient? Is it easy to
clean? I don't plan on any live plants (most of my tanks are planted now, and
that's a job in itself) so plant debris will not be an issue. I just want the
best for the babies. Also, someone recommended a UV sterilizer. Just what is
that, and why would it be necessary? If it adds to the cleanliness of the
tank, I'm all for it.

Any suggestions are greatly appreciated. This huge tank has me a little
nervous!

Deanna