Pump

Life Guard 1/2 hp, rated for 38 foot head max flow 3600 gph. Still almost $300. The gen x version is the pcx-20 and foster and smith has this one for $173 right now. Best of luck, Shaun

 

http://www.marineandreef.com/GenX_PCX_40_Aquarium_Pump_Pacific_Coast_Imports_p/rpc10095.htm
Had to elsewhere, here is the link for the pcx-40

 

I've got a Blueline 70 pump(1750 gph, $250 new) I'm trying to sell to raise money for the UNI tank. Not sure if you're looking to save some money and buy a used one or not, but this thing looks brand new.

Here's the link on Aqua Cave: http://www.aquacave.com/blueline-70-hd-externalbraquarium-water-pump-brby-pan-world-536.html

 

I have a reeflo pump, they are awesome. They operate very quitely. I also have a blueline 70HD. Both are great pumps although I must say the reeflo's seem very impressive. They have power to spare!!!!

 

I still have a used Gen-X PCX 40 for $80

Gen-X PCX 40 External Pressure Rated Water Pump - this pump is comparable to the Iwaki 55RLT - specs are as follows - $80

* Non-corrosive polypropylene housing
* Non-leak sealless pump
* Highly efficient, economical type
* Single phase motor with thermal protector
* Allowable ambient temperature: 0 to 40C
* Pumps are gravity feed design
* Not allowed to run dry
* Designed for both fresh & saltwater aquariums
* Max Flow: 1190gph
* Max Head: 22ft / 6.8m
* Speed: 3000rpm
* Fittings (Inlet/Outlet): 3/4in MPT / 3/4in MPT
* Economical to run-1.2amps,110Volts
* Quiet,cool running,no oiling required.
* PSI rating 10

 

Not sure what to say about that...that pump should have been giving you 900 GPH at 12 foot head.  I sent you a picture of the head loss curve chart via PM.
I run a Reeflo pump and really like it.  I'm also running a basement sump like you plan to.  That being said, there are two types of pumps...those rated for flow and those rated for pressure.  If you're running basement sump, you need to look at the pressure rated pumps.  If your not going to have as much head pressure, then you can go with a flow rated pump.  Also remember, you don't need your return pump to give you all of your water turnover for your tank.  That's why most people supplement with powerheads.  I'm only running at 5x sump to display turnover for my tank.  The Barracuda and the Hammerhead look to be within $20 of each other, but the Barracuda is not pressure rated and the Hammerhead is.  For your application, the Hammerhead provides substantially more flow for the $$.  Look closely at the head loss curve chart when making your decision. 
I hope this is helpful.
--AJ