As digital bookworms hold their breath for the arrival of a sub-$200 Kindle, various manufacturers have encroached on Amazon's turf unleashing an array of impressive e-Book readers. We've outlined today's most popular models to see how they stack up next to each other. However, before you make your purchase, keep in mind that in addition to hardware, it's important to look at the e-Books in each manufacturer's respective e-Book store. Check to make sure the store carries your favorite books and that your e-Book reader supports multiple formats, which in turn gives you more buying flexibility. Here's a breakdown of the most popular standalone e-Book readers on the market today: Price* Screen Size Weight Formats Supported Storage Wireless Network Rated Battery Life Amazon Kindle 2 U.S. $259 6" (600x800) 16-level gray scale 10.2 oz. AZW, PDF, TXT, RTF, Audible, MP3, MOBI, PRC, HTML, DOC, JPEG, GIF, PNG, BMP 2GB Whispernet Sprint 3G 4 days (with wireless) Amazon Kindle DX $489 9.7" (1200x824) 16-level gray scale 18.9 oz. AZW, PDF, TXT, RTF, Audible, MP3, MOBI, PRC, HTML, DOC, JPEG, GIF, PNG, BMP 4GB Whispernet Sprint 3G 4 days (with wireless) Barnes & Noble Nook $259 6" (600x800) 16-level gray scale ------- 3.5" (480x144) color LCD 11.2 oz. ePub, eReader, PDF, MP3, JPEG, GIF, PNG, BMP 2GB (microSD card slot) 3G (AT&T), In-Store Wi-Fi (802.11g) 10 days BeBook Mini $199 5" (600x800) 8-level gray scale 5.6 oz. ePub, PDF, Mobi, Lit, TXT, PRC, FB2, Doc, HTML, BMP, JPG, PNG, GIF, TIF, MP3 512MB (SD card slot) None 7,000 page turns ECTACO jetBook $199 5" (640x480) 16-level gray scale 7.5 oz. ePub, PDF, Mobi, TXT, PRC, FB2, JPG, RTF, MP3 112MB (SD card slot) None 20 hours IREX Digital Reader $399 8.1" (1024x768) 16-level gray 14.6 oz. PDF, ePub, Newspaper Direct, Fictionwise, eReader, TXT 128MB (microSD card slot) Verizon Wireless 3G N/A Sony Reader Pocket Edition PRS-300SC $199 5" (800x600) 8-level gray scale 7.8 oz. PDF, ePub, JPEG, BBeB, RTF, TXT, HTML 512MB None 2 weeks Sony Reader Touch Edition PRS-600SC $299 6" (800x600) 8-level gray scale 10.1 oz. PDF, ePub, BBeB, RTF, TXT, HTML, JPEG, GIF, PNG, BMP, MP3, AAC 512MB (Memory Stick Pro Duo/SD slot) None 7,500 page turns *Prices are MSRP as few deals can be found on these new eBook readers. Louis Ramirez is dealnews' Features Editor.