Actually, you need to review PocketExcel and OfficeToGo (OTG) first. Then you need to set your criteria based on which you like and then tell what makes a difference to you.
I have got lost in the PDA jungle.
Need a good PDA for working with a EXCEL data sheet.
Wi-Fi and good screen quality would be of importance too.
Price is secondary.
Hope for help and thanks in advance.