Just replaced my E4300 with an E4310, pretty close to top spec, i5, 8GB RAM, 128GB SSD - does the job as my primary machine for email and on the go...makes an interesting comparison to by personal macbook pro.
T7500 as my workstation in the office, overkill but it's probably better to buy a top spec machine than waste my time writing efficient scripts to be honest, I like it enough I guess, I preferred the HP workstations but we have the sort of discount from Dell others can only fantasise about...
Oh, pair of Dell U2410s, dual screen for the workstation with the second as an extended desktop for the laptop from the docking station, works well enough though I almost wish I'd gone for U2311H's instead, the 24" panels clutter my desk up...