I'll be the nay-say'er for claim that cards are the way to go...
As a primarily stealth taper myself, I'll preface by saying that my main go-to mics for low-pro gigs are trusty CA-14's (+CA-UGLY pre) > R-09HR, but then again, I do not often use the taping technique that OP does. When I
do stack-tape, I don't feel like there would be too much to gain from using the cards, whereas there could be a whole lot to lose.... specifically, nearer the stacks, there is often a greater amount of commotion (depending on the show of course, but you could face anything from wook dancing, to moshing, fighting, or crowdsurfing). Commotion may require that the taper readjust or turn, push, duck, dodge, or anything else. These actions will be far more evident through the card's than the omni's.
For stack taping, I think that omni's are the way to go. OP mentions not being overly concerned with imaging, but the number one technique of stealthing omni's will yield a decent binaural recording plus should keep his body free to address any crowd difficulties.
OP-- I'd strongly encourage you to take a look at the SUPREMELY tiny CAFS-OMNI's; Chris is on back order right now according to the product's thread, but you may want to reach out to him.
I've also heard that Chris is able to build his mics to function off of the plug-in power on the R09HR-- I can neither confirm this nor guarantee that he can do the same for the original R09, but it's certainly worth asking him.
Chris is a marvelous man with a highly respected product, I'd say take your $1000, buy some CAFS-OMNI's, an R09HR, a CA-UGLY pre, and a nice dinner and a movie for you and the lady in your life
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Chris's CAFS-OMNI's )
