Unless money is no problem, I wouldn't worry about the chemical and biological filtration as long as you are doing frequent water exchanges. For mechanical filtration, I recommend the J325
http://www.aquaticeco.com/index.cfm/fuseaction/product.detail/iid/4609/cid/1219
Pump: Go with the PM20
http://www.aquaticeco.com/index.cfm/fuseaction/product.detail/iid/7663/cid/1928
Plumb with 3/4in poly tubing and poly fittings. What you'll have is a filter that will last for a very long time and will keep your water clean!
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...the oldest task in human history: to live on a piece of land without spoiling it."
Aldo Leopold (1938)
"Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us."
Calvin and Hobbes (Scientific Progress Goes 'Boink', 1991)