Since you already have everything lossless, it doesn't really make much difference. I would do them at 128 or 160, and then re-do any at a higher bitrate if you can hear artifacts on those tracks ...

I have done a shoot out using these three codecs. I started with a 1 minute sample from Metallica's "Fuel" extracted using EAC on secure mode. The three codec's used were;<BR>LAME 3.87 MMX<BR>Ogg ...