Help selecting amp for 3 10W6

Hello.  I searched for the information I wanted, but couldn't find what I need to know.  I am doing some research for a friend of mine who has 3 JL 10W6's and wants to purchase an amp to drive them.  He was thinking of wiring them in parallel, for a 1-ohm load, and wanted me to find an amp suitable for that.  However, after reading some posts here, it seems that not only would a 1-ohm mono stable amp be very pricy, but it wouldn't provide the best "working environment" for the amp.  So, i'm looking into an amp to drive the subs in a series-wired configuration (4-ohm).  As i'm sure you know, a 10W6 is rated at 300W RMS, so it seems that he should need 900W rms @ 4 ohms, correct?

What amplifier would you suggest I look at for him?  His only requirements are that the amp pushes the subs to their full potential (I think he's looking for SPL), and that he can purchase a matching 4-channel amp for the rest of his system.  Thanks!

the JL 1000/1 is exactly what he needs, it will always put out its rms anywhere between 1.5 ohm and 4 ohm, , it self adjusts, , you know what im sayin??   Like most amps will put out 1000 rms at 2 ohm, and 500 rms at 4 ohm, , , , , , , but this amp puts out 1000 rms at 1.5, 2, 2.5, 3, 3.5, 4, ,aight.   So its a super good amp for future changes and plus its one of the best sub amps out there.

If i made a mistake anyone, , please correct me.

I totally agree. I have 3 10W6's (originals, not v2's) and the 1000/1...haven't hooked it all up yet, but I'm working on it. Maybe in a month I can tell you all how it works out.