This Dell has several drawbacks. Too small a case, too limited memory, only one huge HDD, too limited a PSU, etc.
Take a look at the FAQ section and specifically at What PC to build, an update...
My budget is max 1500$. I have been looking at the Dell XPS8500 however the graphics card (NVIDIA Geforce GT640) is not listed in the tech specs required for the Premiere Pro cs6 program and I'm not sure if it's strong enough to support the Adobe programs. If it's possible, I would also like to have a re-writable BR optival drive, but it's not a necessity.
On a low budget, a DIY or a custom system. For under $2K, you could put together a nice DIY system as John did.
Decent Dell and HP workstations start at $3K, and on the low end, I'd recommend HP Z420 over Dell T3600. Decent custom systems (basically DIY but put together and supported by professional integrators) also start around $3K but offer more performance for the money vs. Dells and HPs.
Like Harm, I don't think XPS8500 is a good match for CS6.