Which is better for a DBA (Swarm); powered subs or unpowered?


I want to start building a swarm (starting with 2 subs), on a budget.  Starting with $1000, am I better off buying two used powered subs, three less expensive used powered subs, or a subwoofer amp (eg Dayton SA1000) and two (less expensive) used unpowered subs?  What is the advantage of having a discrete subwoofer amp?  Room size is 13'x22'. 
cheeg

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"it is quite obvious that these individuals have never experienced the extremely high quality bass response performance this concept provides in practice in typical home rooms. noble100 Tim"


This and all the individuals personal variables of room, system, experience, and personal taste seems to have created a circumstance with the home audio hobby that lacks a general acceptance similar to what's in the pro audio tool box.  

Despite the obvious differences between home and pro audio there are some important common parameters at play.

Tim, good sticky post. 


Two questions:
Wasn't Dr. Floyd Toole adamant regarding cables lack of any measurable difference hence no sonic effect in the audio chain? Am I misstating this?

Did Earl Geddes design for Behringer (processor) or simply use their processor?