Ok, so I haven't read the entire thread, but I'm going to spout some knowledge about fans and cooling in general.
Obviously the more CFM the better, but when it comes to positive and negative pressure in cases...well that's an interesting subject. Most people like to have more air coming into their case rather than going out, because it's supposed to minimize the amount of dust in your case. Whether or not this is actually true is debatable. No matter which way you slice it, you're always going to get dust into your case somehow, because you're always pumping outside air into your case whether it be through the intake fans or through cracks in your case.
Dust filters don't really stop dust from getting inside your case in my experience. They end up restricting airflow more than anything else, and any time I've ever used dust filters, I still get dust inside my computer somehow. Filters just don't seem worth it to me because they don't do a great job anyway.
Many say that positive pressure will give you better temperatures. The argument is that negative pressure will cause exhausted air to be taken back into your case through cracks or ventilation holes, since the exhaust fans are throwing more air out of the case than the intake fans are throwing in. This makes sense in theory, but it depends where the ventilation on your case is. Most ventilation holes are in the front of the case or near the expansion slots in the back. Cool air is going to be going into these ventilation holes anyway, because most exhaust fans are at the top and top rear of the case, and as we all know hot air rises.
I've never seen any evidence to suggest that positive pressure improves temperatures and cuts down on dust. For the coolest possible build, I would just suggest installing as many fans as possible.
Also, fans with higher static pressure are better for things like radiators and heat sinks, but when you're installing a simple case fan, you're not going to need a lot of static pressure because you're not trying to push a lot of air through a dense fin arrangement. For normal case fans, just look for the best airflow to noise ratio that you can tolerate. For radiators and heatsinks, look for high static pressure.
The Cooler Master Sickleflows are nice fans, but they do rattle from time to time. That being said, I'm not sure if there is a better red LED fan out at the moment.