Help upgrading my Dell XPS 8300

Hey. I need some help upgrading my pre-built Dell XPS 8300. I would like to upgrade my GPU and PSU but I am not sure exactly what to get or if it will even fit. Or if these are compatible with my motherboard. I'm trying not to go TOO far over $300.00.

I was thinking about a EVGA GTX 560 ti. What the heck is the difference between these though??

http://www.newegg.com/Product/Product.aspx?Item=N82E16814130604
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2148471&CatId=3669
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7191450&CatId=3669

And for a PSU I was looking at possibly this one.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020

Here's what I have right now. Let me know if you guys need more info.
Intel core i7 2600 3.40GHz
8GB Dual Channel DDR3 665MHz
Dell Inc. 0Y2MRG Mobo
AMD Radeon HD 5770
1TB Seagate SATA HDD

Don't know what all this means but I copy/pasted my Mobo spec from "Speccy":
Manufacturer Dell Inc.
Model 0Y2MRG (CPU 1)
Chipset Vendor Intel
Chipset Model Sandy Bridge
Chipset Revision 09
Southbridge Vendor Intel
Southbridge Model H67
Southbridge Revision B3
System Temperature 26 °C
BIOS
Brand Dell Inc.
Version A06
Date 10/17/2011
Voltage
CPU CORE 0.996 V
MEMORY CONTROLLER 1.500 V
+3.3V 2.820 V
+5V 2.782 V
+12V 11.040 V
-12V -8.880 V
-5V -8.880 V
+5V HIGH THRESHOLD 2.742 V
CMOS BATTERY 1.596 V
PCI Data
Slot PCI-E
Slot Type PCI-E
Slot Usage In Use
Bus Width Unknown
Slot Designation PCIE1
Slot Number 0
Slot PCI-E
Slot Type PCI-E
Slot Usage Available
Bus Width Unknown
Slot Designation PCIE2
Slot Number 1
Slot PCI-E
Slot Type PCI-E
Slot Usage Available
Bus Width Unknown
Slot Designation PCIE3
Slot Number 2
Slot PCI-E
Slot Type PCI-E
Slot Usage Available
Bus Width Unknown
Slot Designation PCIE4
Slot Number 3
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More about help upgrading dell 8300
  1. EVGA GTX 560 ti nice. It maxes at 170W vs. 105W for your HD5770. Video card overclock would add another 30%. So you need another 100w above your current system draw.

    You should have the 460W PSU in your Dell. It will handle your load with the 560ti no problem. (I am using an HP 460W PSU in my system running i7-920, x58MB and 1.5GB gtx 260. All those components each use more power than your components. The load measured at my UPS is less then 300W at the plug (240W at the PC) gaming with a mild OC on the GTX260.)
  2. p.s. EVGA makes a very nice OC utility, evga precision. I use it on my gtx260.
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