I would get (2) Penguin 200 Bio-Wheel filters for it. They're good for 50 gallons each.
That's exactly what I have running on my 55 gallon tank. I like them, but others around here prefer externals.
cfmurray,
I'd get two heaters if I were you, about 200W each - one at each end, with a separate thermometer on each end as well.