[LAU] multichannel interface recommendations?

we are searching for a new audio interface for a project studio and interested in the experiences others have had requirements are: * 8 (or more) channels simultaneous recording to computer * at least 4 preamps for mic level inputs * USB2 preferable to Fireware, but.. * 100% linux compatible, ideally with a stock kernel * under $500 USD if possible less important is real-time monitoring functionality - this will mostly be used for bands playing live there are several new inexpensive USB2.0 interfaces that would apparently fit the bill if supported under linux but it is not clear if they are, seems like in contrast to FW most are not anybody have any recommendations?