1. you need no enclosure. I use Velcro on all my SSDs
2. it will depend whether you buy a Sata2 or Sata3 SSD. The cables are different beause the mobo ports are different. But check first whether you have Sata3 ports on your mobo before you buy a Sata3 SSD.
Here is an example of a Sata3 cable: Newegg.com - OKGEAR 18" SATA 6 Gbps Cable, Straight to Left Angle W/ Metal Latch, Black, Backward Compatible 3 Gbps and 1.5 Gbps