Recommendations for 2 or 3 monitor setup

Hello, I would like some help regarding monitor stands.. I've attached a pic of my setup below

I originally bought a 24" with the plan to upgrade to a larger monitor in the future, but prices never came down (haha).

I can get a second identical monitor on craigslist for $100. The only problem is, my desk isn't big enough for a second monitor.

Would it be better/cheaper to:

1) wall mount the monitors (can high quality wall mounts be had for cheap?).

One reason I'm thinking wall mount is so I can have more desk space. I am also wanting to tilt the monitors vertically (portrait mode), but all of the monitors with tilt capability cost $300

or

2) triple monitor stand (any recommendations for an affordable stand and would allow me to position monitors in portrait?)

3) get a longer desk? I think I'm gonna need a longer desk regardless of what I choose to go with.. haha

If it's wall mount I'm looking for some recommendations as to brands.

Another question I have is if the difference between 2ms / 5ms monitors is noticeable? I currently have a 5ms.

How about moving the speakers off your desk? You could wall mount them. Otherwise I don't see a difference between having two monitors on your desk and having a double monitor.

I wouldn't recommend a wall mount, that would really limit your options in the future. Plus they are a pain to setup.

Sorry to ask, but then in the 3 monitor setup would the speakers go in front of the monitors?