I normally recommend Samsung solid state drives. They perform very well and have a proven track record. The 840 EVO and the 840 Pro are both good choices. If cost is a concern, then go for the 840 EVO. The 840 EVO is an excellent value for the money spent. In typical consumer use you probably will not be able to see or feel any differences in performance between the two. You would have to run synthetic benchmarks designed to grossly exaggerate minor differences in order to be able to measure them. Based on the latest information published by "The Tech Report" there does not appear to be any valid reason to be concerned about the type of memory used and ssd longevity. They have been torture testing 5 ssd's since last August, including an 840 Pro and an 840 EVO. The 840 EVO is hanging in there with over 600TB of data written and deleted. In the latest update it was speculated that all 5 ssd's will probably survive having a full petabyte of data written and deleted.
I maintain the ssd database listed in a sticky at the very top of this forum section. Here is the link:http://www.johnnylucky.org/data-storage/ssd-database.html
Scroll down to the Samsung section or any other brand you are interested in and follow the links to the technical reviews for the different models.