It all depends on the setup you really want, ultimately. I actually have one of their 31 stations. 4 24" monitors in a 1 over 3 wide configuration. I got this because it is easy to move to a 6 if I ever wanted. Just 2 more monitors and a horizontal bar on top.
Remember - it does not matter how big your monitors are, it is all about the resolution of the monitors, well unless you want the images bigger. The higher the resolution, the smaller the text. for us old guys, bigger is always better. If you have a 60" plasma - well again, all about the resolution the cards can support.
Yes, you can build your own cheaper (if you can/want to) or find a local guy to help you out - but it is nice to call someone who can speak 'English & non-tech', login to the system and fix your problem when, and if you have one... my feeling... but... what ever...
1 good swing day - it is a small price and you will never look back - but the reliably system always wins