Upgrading Gaming PC

[BigWalker]

Hello Tomshardware, long time since i've posted here and i've got a quick question regarding my PSU on a little upgrade i'm doing.

Current setup is:
ASUS M5A88-M
AMD Phenom II X4 965 Black Edition
CORSAIR DOMINATOR 8GB (2 x 4GB) 240-Pin DDR3
EVGA GTX 460 SE 1GB
Antec EarthWatts 650W
Seagate ST3750630AS 750GB 3.5 3H SATA HDD
Stock HeatSink
Antec Case Fans 2x
Generic HP Case 16 X 16 X 8

What I intend to do is grab a new pair of Seagate HDD's since I feel like i'm being bottlenecked pretty hard. http://www.newegg.com/Product/Product.aspx?Item=N82E16822148840
Add another two sticks of Ram
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145313
And replace the stock Heatsink with
http://www.newegg.com/Product/Product.aspx?Item=N82E16835181015

Now this is a good Christmas gift for myself, but i'm concerned about what my PSU can handle. I've yet to Overclock my 965 BE as well, and with the Heatsink I fully intend to do it. Can my poor Antec weather this upgrade?
(I also intend to grab a new case along with all of this, Hohoho.)

 

[hilltopmonk]

you should be looking at getting a SSD for disk replacement for speed (boot to Win7 in under 30s with all background processes loaded easy) - HDDs are only good for capacity nowadays - unless you need an extra 2GB storgage space.

PSU will be fine - could even bolt an SLI config in there without any sweat

 

[FinneousPJ]

Seconding the SSD.

 

[BigWalker]

Definately looking into an SSD for boot, any suggested brands?
And i'm grabbing at least one of the HDD's for storage space in the future.

 

[FinneousPJ]

Samsung

 

[computernewb]

For gaming i would say the graphics card is the most important. I would upgrade the gtx 460 to gtx 660 or better depending on your budget. It would be a vast improvement.
http://www.anandtech.com/bench/Product/542?vs=660

Also 8 gbs of ram is more than enough for gaming. there is no reason to get more ram. And your power supply is fine for overclocking.