Best in breed you will find the well known and widely used eDraw Max.It is one of the leader in the category of the network drawing software. But it can also be used for other diagraming needs. We have notice the following advantages : ease of use and simple to learn. large choice of diagram types and icons. Cost less than $100. It is an alternative for Visio.
LanFlow is one of the better tools. ease of user, very ergonomic GUI, wide range of diagram and network icons, network diagram templates. For around $90, you have a best choice, one of the best of the low-cost alternatives to Visio.
NetProbe network diagramming tool, is part of a real-time network device monitoring solution. The killer function of this software is that it will scan your real network to detect component and feed an empty diagram template with them! NetProbe is available in a limited to 8 hosts edition that is free, if you want to take adavantage of all its features, you’ll need the Pro version of NetProbe (allowing for up to 20 hosts) for only $40.00, the Enterprise version (allowing for 400 hosts) runs $295.
Condider also Visio!
Visio is, as you already know it, the standard for diagramming in the Windows world. Amazing diagrams, ease of use, share data-linked diagrams with others via a Web browser, wide range of templates. Visio is the first class tool for diagramming if you can afford it. It’s price : $249.99 for the Standard version, $559.99 for the Professional version.
Or consider the free diagramming tools