For the heater, I would use the ViaAqua Titanium tube heaters. They are excellent heaters and have the external box temperature control. They are very reasonable priced as well. I bought a 100w for my 14g nano for around 40 bucks. I have a larger one on my 55g reef tank as well, both keep the temperature EXACTLY what you set the thermostat for.
Now on the power heads, I have always had great luck out of the Koralia. Never had a noise issue or anything like that, they flow A LOT! So in this case, bigger isn't always better.
I spare no expense when putting together any system I have, however 400 dollars for a power head is ridiculous. That is money that would very well be spent elsewhere.
If anyone pays that for a power head for a home system, they didn't see you coming - they HEARD about you coming, :rotfl: