it's similar to corsair neutron xt.
assuming you're using the ssd for common usage, liteon s900 and transcend ssd370 should be good enough for you. you should check out garage sales also.

after-sale services depend on many things, i have no comment on this.

yes samsung 850 evo is ok for that purpose. i suggest you go for at least 500gb, because the tbw is double (150tb) compare to those 250gb and below (75tb). the warranty period is the same, 5 years.
.. and i thought you wanna go for best bang for buck.

consumer sata ssds these days are categorized into 3: value, mainstream and performance. imo, anything in the mainstream category and up should be perfect for common use and for work. the three mainstream models are fine. they are from the brands that have the lowest return rates based on hardware.fr reports for some times now. however of the three i will pick up 850 evo for its longer warranty period.