[APML]: Best Beginner Film

["Emilio J.Robau, P.E." <ejr@consult-rwa.com>]

I am looking to start astro-photography.  I plan to begin with piggyback 
photography with my OM-1 and Meade 10" LX50.  What is the best film to use. 
 I plan to guide my photos and am near dark to medium dark skies.

I am considering Fugi SuperG plus 800.  Is there any difference between the 
Super G 800 and Super G plus 800?  I am also considering Kodak Pro PPF 400. 
 Are there any other suggestions?

What should I use for longer direct focus shots.  Say 30 min or more.

Thanks in advance.