For a tank that large my recommendation would be to go external. There are several advantages to external;
1. No added heat
2. No ceramic shaft to wear or break
3. No cheap plastic bushings to get distorted
4. No shock potential
5. Minimal cleaning
6. Reliable
7. Does not get noisy with age
If the sump is in the basement and the tank upstairs then you would need a high pressure external like a reeflo etc. If the sump is under the tank there is a good 1/8hp spa type pump for around $240. It uses 1 1/2" in/out quick disconnects and is rated at 3000gph 0' head and max head is 23'. It is dead quiet and uses under 200 watts.
Cheers,
Tim
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