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Which Upgrades first? Dell XPS Special Edition

Solution
SSD would be my first upgrade, would make the overall experience faster. Also, if you're a light gamer, 750 Ti is a fine card for that, you may need to upgrade PSU for GPU upgrade, not sure if it comes with anything higher than 350W.
an SSD will be the biggest improvement first. If the video rendering uses lots of memory, upgrade that next.

Upgrade the PSU if/when you upgrade the graphics card. The factory PSU on the 8700 is rated at 460 watt, has PCI 12v connectors for graphics card, but the specs on the PSU are not as good as a solid aftermarket 450 watt PSU.

I put a seasonic X-650 80 plus Gold in, and it was a sung fit, but it does fit. Quieter than the OEM PSU also. Several good vendors have PSUs that fit the 8700.