If going by list, 2899 they are now having it for 1399. So for 100 more you are getting the XBR series over the z5100. Did online look at frys and stating 2599..


XBR info
16:9 Full HD 1080p Resolution Panel (1920x1080)
BRAVIA Engine™ 3 fully digital video processor
Motionflow™ 240Hz
Live Color Creation™ technology w/ WCG-CCFL backlight
BRAVIA® Internet Video1/Widgets
USB to view photo/music/video
7 HD inputs (HDMI™ x4, Component x2, PC Input x1)
XMB™ w/ enhanced 3D Favorites Menu
x.v.Color™/Deep Color
Ethernet x1 w/ DLNA photo/music/video player
BRAVIA® Sync™ 2
BRAVIA® Link ready (DVD, Input, Wireless)
24p True Cinema
Exceeds Energy Star® 3.0 Requirements by more than 15%
DLNA® with photos, music, and video
TV Guide® Interactive Program Guide5
Scene Select lets you easily manage your settings
ATSC™/NTSC tuner with QAM
Favorites Menu

Z5100 info
16:9 Full HD 1080p Resolution Panel (1920x1080)
Motionflow™ 240Hz technology
BRAVIA® Internet Video3
BRAVIA® Widgets
BRAVIA Engine™ 3 fully digital video processor
USB with photos, music, and video
DLNA® support for photos, music, and video
TV Guide® Interactive Program Guide
Thin and slim design
HD input x 7
Xross Media Bar™ w/ enhanced 3D favorites menu
Scene Select
Bravia® Link module compatible
BRAVIA® Sync™ capable1
ATSC™/NTSC tuner w/ QAM
Exceeds ENERGY STAR® 3.0 requirements

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Item is in middle of page. Says Sony XBR, using fry's online to match number. here is what I got.
SONY KDL-46XBR9

SONY:
FRYS.com #: 5915234