What it comes down to, is what the effective flow rate is going to be. If it's going to be above 100 gph, I'd recommend 1/2 in. tubing, otherwise, 3/8 would do.
What you need to do, awesterink, is figure out what kind of flow you're getting, with the bucket test. Once you've done this, you can then figure out if you want to:
a) get a better pump, and use 1/2 tubing
or
b) just swap the tubing for 3/8.
That's my $.02 ...
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