t1mmbo, since no one has replied I'll throw in my 2 cents.
I use an Eco Plus 5 linear pump, it's small but does a good job for small shallow ponds. It's attached to a 50 ft. soaker hose, I replace the hose each year. The soaker hose is zip tied to a garden hose that is filled with sand so that the bubble hose stays on the bottom. You can buy weighted bubble tubing which is more expensive but probably does a better job.
The pump has been running for 21 months (full time in the winter) and hasn't failed yet.
Here's the pump I have.
http://www.aquariumspecialty.com/catalog/product_info.php?cPath=139_267_532&products_id=1187
