I got a T620 recently (16x 2.5" bays), and found a deal on some PNY 1TB SSDs for $30, but looks like it expired. You'll definitely get a better bang for your buck on the 3.5" drives.
I recently obtained a Dell t620 that I've rack mounted, and I'm using to upgradey homelab. I'm also thinking I should upgrade my routernsince I'm having to reconfigure a lot with the new server(I have a 12 year old Netgear wireless router).