x86_64 is not more expensive than x86, there are a number of Turion notebooks from ASUS, HP, et al. this is my choice, since it allows for binary-sharing and distcc with a shuttle, but if you dont care about 64bit, pentium-M is also great, and runs pd quite a bit faster using less energy than a comparably-mhz'd athlon32 or P4..
well, i'd go for a pentium-m unless you like fan noise ;-)
didnt try the latest pd CVS. does it fix the 64bit incompatibilty issues?
unless i really missed somethin, pd is broken on 64bit hardware ... if i'd have some time / get my hands on an 64bit machine, i'd try to do something ... so the only thing to do is waiting ... 1, 10 or 100 years ... hopefully pd will support 64bit machines before 128 bit processors become common ...
t