Panny 30 for b) play seems to have the least issues. I have had one since Nov and it has served well. FW 1.5 to address the LFE bug on UPCM tracks via bitstreamed is suppose to be released tomorrow. Keep in mind there is no forced 24p option, so if EID is off in the display, 24p will not be had.
Mark Sony XBR5 / Pioneer Elite VSX-94THX / Panasonic DMP-BD30 / Toshiba HD-35A / Pioneer Elite DV-48AV / SqueezeBox 3 / SA 8300HD / all with a Pronto TSU7000