Last week I bought a brand new 250GB 850EVO for $70 from Newegg Ebay and it lives up to it's name. 500MB/s+ read and write speeds. The Corsair Force LX specs say a 560MB/s read, but a much slower 300MB/s write. It also has 1/2 the cache of the EVO, which has 512MB. The EVO has a 5 year warranty, the Corsair has 3 years.
The EVO has a 2,000,000 hour reliability, the Corsair has 500,000 less, at 1,500,000.
The clear winner is The Samsung 850 EVO, which wins every time.