Im resealing my oil pan in my 98 gst and i was wondering what kind of sealent i should use. And if you have any other advice let me know.

RTV high temp gasket maker is what i use... and i know a few people suggest it!

Permatex Ultra Grey. I use it on damn near everything. The factory uses it as well for many things (tranny, etc).

I am sure either of those will work fine.
I don't remember the stuff direct from the dealership being very expensive either but it looks like grey silacone to me.