I think Buxton is a pretty good paper too. For me, it prints a lot cooler in tone than platine or COT320, all other things being equal. It definitely has some deep blacks, but I think the shadows seem to block up a bit more than some other papers. This may be an exposure issue though, and maybe it just is slightly faster than those other papers. It also will allow you to make a 100% platinum print that really looks great. Of course, between the $14.50 paper and $1100/oz platinum, screw ups on a pure pt print tend to be sort of disheartening.
If you want an ultra-cheap, ultra available paper for palladium, check out Southworth 100% Rag resume paper from Office Depot. It has a watermark that makes it good only for small prints, but it makes a surprisingly nice palladium print with no additional treatment needed.