Apart from these, why don't you try getting yourself the matte screen protectors?

http://cgi.ebay.com/2-MATTE-Anti-Gla...#ht_2452wt_939

this should help you eradicate most finger prints and also improve screen readabilty in direct sunlight !!

I had these on my 5800 and they worked great, never gave me any problem, I am awaiting these on my N900 now

Cheers