I think you would be down grading your monitors going to the Yamaha Club series or similar spec'd floor monitor, the BE cabs you have are a step above the club series, JBL JRX & MRX series IMO.
I tend to agree with this. The BE boxes are a step above the MI class GC type boxes.
I think you would be better off saving up a bit more money (maybe replacing one monitor at a time) and going into something like the EAW micro-wedge
:Invalid Link Removed
Great sounding monitors and very compact.....and worth the money.
Still pretty expensive boxes, you really get what you pay for here. Its a buyers market in the pro world as well. Dave's design was one of the first well received coax type, since, there are many coax designs out there. Powered and conventional.
But, if money is an issue.......the EAW is a great design to try and copy with a coaxial speaker from another source
Like maybe Radian? That is the driver that Dave used. Also, P-audio makes a series of coax's as does B&C. Building your own wedges is not as easy as it sounds. The microwedge is a fairly complicated peice of wood. Only a few pro audio tour companies has been able to do it successfully, Clair, Sound Image, Ratt, NWS (which is the pre-cursor to the new meyer box) and the ilk. The EAW Microwedge is really just a re-badged Ratt wedge. Radian had them as well.
For next teir monitors, you may look at the yorkvilles or jbl. A step down from the pro touring type, but in the same range or above as the BE. Also maybe the JBL srx series wedges. Low profile, decent price. A step up from the BE/yorkies. Building wedges that would be better than the BE's, would take alot of resources. Prototyping, driver selection, testing, crossover design, finishing, etc.. You really just cant do it with a table saw and some lumber

In the end you would being better served to just buy new. It would be cheaper. You could also check soundbroker.com, to get an idea what the used market is doing.