I use the cobalt mj 1200s, but people use a lot of different pumps. I also use a cheap pond pump for pumping out of the can
nice progress, slow and steady gives you time to think and plan out. It will be tricky to find a pump with low power that can give you the 500 gph. The Reef Octopus HY16000 says it can do 1200 gph @ 11 ft head but that's at a cost of 250 watts. same as the Bluelines. I run a SpeedWave DC 10k with no issues so far, it's only been running 6 months though and the Waveline DC 12k was recently released which claims 3170 gph @ 0 ft head and a max height of 19.9 ft @170 watts.
Why is it sitting?
And depending on how far, you could use something simple like an aqualifter.