Looking for a fish finder

I was hoping that I could draw from the knowledge of the members on this site to help me with a tough decition.  I was looking at the lowrance series of fishfinder but then I came across the Humminbird 787c2.  For the dollar value I can't find a lowrance that seems to compare.   The bird has higher resolution at 640V x 480H.  Where the Lowrance has 480V x 480H.  The bird alsAdd-on Accessory Capability:

Wireless Sonar Link, WeatherSense Barometric Pressure, PC Connection Kit & SystemLink

Depth Capability:

1500 ft

Display Window Size:

5 Diagonal

Display Matrix:

640V x 480H

Display Type:

Color TFT, Sunlight Viewable, Hemispherical Viewing

Power Output:

500 Watts (RMS), 4000 Watts (Peak to Peak)

Operating Frequency:

200kHz & 83 kHz

Sonar Coverage:

20° & 60° @ -10db

Target Separation:

2 ½ Inches

Temperature:

Included in transducer

Speed:

GPS speed included

Transducer:

Inside Hull or Transom Mount

Power Input Range:

10-20 VDC

Mounting:

Gimbal or Optional In-Dash

Unit Size:

Installed on Gimbal: 6.9W x 7.7H x 4.5D (min)

Installed In-dash: 6.9W x 5.4H x 1.25D; Required Minimum 3 behind dash clearance

Communication:

NMEA O183 Data Output, Advanced Accessory System

Cartography:

Built-in 4 nm UniMap; Optional Navionics Gold HotMap Premium on MMC or SD Cable

GPS Features:

WAAS, 2000 Waypoints, 50 Routes, 25 Tracks with 20000 Points Each

These are the spec on the bird.  I can get it for $629 so for dollar value I think its the  best buy.  Does anyone have one of these and if so how do they perform compared to the Lowrances.  

Does anyone have any thoughts on the unit.   any help would be apreciated.  

Thanks Scott