In theory, laptops from Dell should work with Linux. In practice, not so much, especially if you like to sleep and wake up from sleep everytime without a crash + a reasonable power consumption, both during use and during sleep. IMHO consumption during sleep far more important: if I didn't plug the computer, I expect it to wake up immediately (no S4/suspend to disk) and with less than 0.5% of battery lost per hour (so…
I recently got a Latitude for work. Linux works fine, but I could not get the wifi to work on FreeBSD.
You'll be relegated to using Linux in a VM for wireless, or downgrading to old hardware.