RepliGo.... not sure.
Documents to Go is essentially Microsoft Office products for your handset (Word to Go, Excel to Go, Powerpoint to Go, etc). They're great for basic viewing and editing of documents as long as you don't plan on making a lot of format changes or creating new documents. However, if you want all the spiffy features (such as New, Paragraph, and word count), then be ready to shell out something like 70 bucks for Word to Go Premium.