Your gpu does not require a psu more powerful than the Dell OEM 460w.  The EVGA you were considering is a good deal. You would not find a much better deal. Do not get the replace psu in your second consideration. It is a never heard of name and thus risky. NVIDIA(R) GeForce(R) GTX 960 with 2GB GDDR5 Graphics Memory just needs one 6 pin gpu connector. EVGA one gives you 2x 8pin (6+2). no need to worry about extra cable length for 8910. It is a compact case not requiring extra long cable.  Typically aftermarket psu offers longer 24/4+4 pin cables than Dell OEM.  EVGA has 550-600 mm long cables which are at least 21” long. The psu is designed to work in full ATX case with room for cable management behind motherboard mounting tray. In 8910 case you have no need to be concerned about having not long enough cable. PS bestbuy has EVGA 600w non-modular psu 80 plus (not bronze) on sale. [URL]
Can someone recommend an aftermarket power supply for my Dell XPS 8910.  It formerly had power supply Dell part no.  AC460AM-01 and is a 460 Watt power supply.  I would prefer a slight upgrade in power and quality. I have a graphics card (490-BDEF : NVIDIA(R) GeForce(R) GTX 960 with 2GB GDDR5 Graphics Memory) and an optical drive (429-ABBB : BDRE Drive (Reads and Writes t o Blu-Ray disks) and I want to know that the appropriate cables and plugs are compatible. Also, I think I saw talk of an "extended cord" required due to the swing out mounting of the power supply in the XPS 8910 tower.  Is that a thing or should I be fine? Appreciate the advice.   I was considering this: [URL] or this [URL]
XPS 8910, replacement PSU (AC460Am-01)