There are a ton of recordings out there with the 853s and quite a few with the C4s. I have seen 853s go for $120 NIB on Ebay lately. If you go to
fullcompass.com, they have them new for $146 each which is still a good deal IMO.
http://www.fullcompass.com/products/pages/SKU--10074/index.htmlI believe these are the ones with the XLR termination to be run with a preamp providing phantom power, but they have other termination options also. I have seen people cut the termination off these and add mini XLRs so they can be run with a bat box or phantom power (you'd have to make miniXLR>1/8 cable). If I bought an additional set of mics, these would be the ones given the price, size and availability of additional caps.
I think that both the C4s and 853s are 20-20kHz. The C4s run about $300 and have both card and omni caps included, but offer no other caps. They also come with a Tbar and shockmounts, but you will need a pair of XLR cables.
What kind of preamp will you be using these with?
EDIT: Some of this was just covered by Ray cause he can make the keyboard spell things faster than me
