Here is a thought to consider for you, Larry.
It is unlikely that K-5 will be /significantly/ better at higher ISO
than K-x. Say, a stop, may be stop and a half. Of course you cannot dial
ISO 25,600 on K-x, but if ISO 25,600 of K-5 is /similar/ to ISO 3200 on
K-7, you might not want to use it at all.
K-5 is said to be improving significantly over K-7 and consequently over
K20D. Since you have two cameras, you have your needs covered either by
K20D or by K-x depending on lighting conditions.
In my opinion, if you were to replace both cameras with just one K-5,
your pictures won't be /better/. But it will be /easier/ for you to get
those good pictures that you're getting now with your present cameras.
You won't have to deal with ergonomic differences (buttons, modes, etc)
between your present two cameras. You will have somewhat better AF and
somewhat better metering and 100% viewfinder. How much any of these
improvements are going to make your life easier is difficult to see -
you would have to be the judge. But the fact that your K-5 will meter
more precisely than, say, K-x won't change the composition or lighting
setup or even timing of the shot taken (knowing that you shoot (*) a lot
of dancing people). So like I said, K-5 is unlikely to give you
/significantly/ better pictures, but it is likely to make your life
/easier/.
Whether or not this warrants "extreme fiscal irresponsibility" - who am
I to tell you?!
I do suggest that you give Topaz Denoise and high ISO images of your
cameras a try. They have fully operational 30 day trial - you may be
surprised like I was. Surely, my K-7 and Topaz Denoise do not constitute
fair replacement of K-5 high ISO abilities, but it is the best I can get
with my money right here right now.
Boris
(*) To prevent puns, I should immediately say that all people whom Larry
shot so far were unscathed /grin/.
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