I agree with Dakar on the Squids.They do put extra head pressure on pumps causing a reduction in flow rate.If not cleaned bi-monthly,they seem prone to failure from calcium buildup.I recently read a thread discussing velocity/flow rates/head pressure with SQUIDS.Seems 700GPH is optimal for this device.Of course,your gonna need about 1100-1200gph@0' head pump to achieve that.
The QuietOne4000 is rated at 1017gph@0'.In my tank i have the same pump.With 3-elbows,2-45's,and 1" PVC @4' head i'm doing 720ish.I think with the additional pressure from the SQUID,it would bring that down to550ish.The flow chart for the QuietOne4000(high head pressure version) pump claims 900gph@4' head so after SQUID loss,that should put you close to the 700gph mark.A MAG12 would be another choice.
AS for the wavemakers,I wouldn't waste my money on one.All they do is turn your pumps/powerheads off and on.In most tanks,they don't have nowhere near enough flow as it is.Why would you then want to cycle your pumps on and off so now only 2 of your 4 powerheads are on at 1 time.For the cost of that wavemaker in the link above,you could buy a closed loop pump and really be able to provide some current.