Are you really prepared to spend that kind of money? I have the LinkRunner Pro and the CableIQ from Fluke - Both are awesome for what I use them for, but they were about $1,500/each.
Oddly - the LinkRunner will show IP, but not Gateway (from DHCP) - I ended up switching to a BlackBox unit for some testing.
The LinkRunner is cool, especially for IP testing, but the CableIQ is what I use 99% of the time - it does better cable testing and certification. You can test a whole building then download the results to a PC and print them - good for client satisfaction.
There are a million cable testers out there for $100 or so - they basically test continuity - these more advanced testers cost way more than most people can spend, but they do help considerably with real-world testing. I've seen plenty of situations where a cheap tester passed (the lines were connected) but there was too much noise. I love being able to graphically see where the line break is, or the line tap, or the noise source. When I'm on an out-of-state job, it saves me a lot of time.
As an added bonus, the CableIQ has optional adapters for testing speakers; plus it'll do coax out of the box; the remotes on the LinkRunner didn't do Coax. Also, having 8 remotes saves time tracing a building - quite handy.
That all said - professional cabling companies spend about $15K for their testers - they certify more wiring types and have modular connections for testing fiber and other options; it just depends on what your intended use is - can you elaborate?