I'm looking for an external 2TB SSD to be used with the 1TB I'll have with the 27" iMac I ordered. The Samsung X5 is fast (2800/2300) but that speed carries a price tag of $1399. Their T5 is only rated to 540 MB/s. It's $399 and seems to be popular I'd ask if I'd notice a real world different between the two but even if I did, the $1399 is out of my budget. Is there anything else I should look at in that price range?