The misters you showed will work well, especially since they are designed to work with typical house water pressures (40-60psi). But if you could run them at 100-120psi they would work better.:) Your idea to have extras and swap them if clogged is good. Not sure what pump you are thinking abt from harbor frieght, but I use a SurFlo 8000 series in 120v that had a 150psi pressure switch that I've by passed to get to 200-210psi. BTW these pumps can be had currently for abt $130. (google Streamrite Supply)
The misters I'm using are made by Bete Co., and are brass "J" style impingement nozzles with a .012" orifice. There are cheaper versions of these made in plastic that are available from AI, an aeroponic supply outfit.
For timers I use Sentinel, MDT-1 to control lights and FrapaPlas fogger and a DRT-1 to control the pump/mister system. BTW the fogger is on a 24hr cycle and the pump/misters are on a day time only schedule. I also have a photo cell that switches the fogger from nutrient solution when the lights are on to RO water durting the dark period, gives me a cleaning cycle at night.
When I finnally clean up my ruff plumbing and wiring, I'll post a picture of it all.
That's all the time I got right now, lights just came on so I have some work to do, plus I then need to get to my other grow. I'll try to answer more later tonight when I get back.:D