Need advice

We need a little more background in order to fully help you. What are you planning on doing with this pc? I am going to assume gaming based on the large jump in gpu's. I would invest in 4gb of ram g.skill has some excellent deals right now on newegg. Also is the tower a micro atx like the name suggests? if so your current mobo will not fit I suggest the coolermaster 912 it is cheap and has plenty of features.

Thank you for the quick reply   yes i'm planning on gaming. In the Specifications it says it supports both MATX and ATX.

It really depends on which 450 watt PSU that you have.

Some can produce more than their rated power. And some will self-destruct trying.

What more do you need to know? I'm not very good at this.  

It is an KY -400ATX. seem like it is 400 watt and not 450?

Here is a link to what you might want to fill out, it helps organize things so that people can help you faster and more efficiently.

http://www.tomshardware.com/forum/261222-31-build-advic...

Do you have enough power connectors on that power supply for the new card and the 8 pin atx board power connector? it's gonna require 2 molex plugs for the gpu card power adapters or 2 - 6 pin pci-e connectors. I don't think yours has all that So yes, you will need to get something very dependable as a psu so you don't undervolt and ruin your new equipment. Here's a nice Thermaltake TR2 W0388RU 600W ATX 12V v2.2 Power Supply for only $35 after rebate. Or a better deal and in my opinion better psu is this OCZ StealthXstream II OCZ600SXS2 600W ATX12V v2.2/ EPS12V 80 PLUS Certified Power Supply for only $30 after rebate. I'm sorry but did I miss something? I don't see a memory upgrade and your DDR2 ain't gonna work on that board. Here's some nice G.SKILL ECO Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL8D-4GBECO for $80. Are you gonna use the stock cpu cooler? Soes it come with one. If not you are going to need one of those also.

Approximate Purchase Date: the closer the better


System Usage from Most to Least Important: gaming and surfing.


Parts Not Required: I have already bought and installed the ATI 5850


Preferred Website(s) for Parts: newegg.com


Country of Origin: Sweden


Overclocking: Maybe


SLI or Crossfire: Maybe


Monitor Resolution: 1024x768

Then i need to upgrade the PSU and RAM too. thank you!  
At the site im planing on buying the cpu it says "Boxed w/fan" is the stock cpu cooler not good enough?

The stock should be fine at stock speeds as long as you have good air flow through your case. Once you start overclocking I find a Lot of people are now using the COOLER MASTER Hyper 212 Plus Intel Core i5 & Intel Core i7 compatible RR-B10-212P-G1 120mm "heatpipe direct contact" Long life sleeve CPU Cooler. Only thing is you need to make sure it will fit in your case. It is 158.5mm tall so check that before you buy.

I almost always suggest that people buy a new cpu cooler. They will run you around 40 $ for a quality one. Not all stock coolers are bad just the majority.

So this is what i am thinking of buying:

COOLER MASTER HAF 912 RC-912-KKN1 Black SECC/ ABS Plastic ATX Mid Tower Computer Case.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

OCZ StealthXstream II OCZ600SXS2 600W ATX12V v2.2/ EPS12V 80 PLUS Certified Power Supply.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory Model F3-12800CL9D-4GBNQ.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

ASUS SABERTOOTH 55i LGA 1156 Intel P55 ATX Intel Motherboard.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Intel Core i5-760 Lynnfield 2.8GHz 8MB L3 Cache LGA 1156 95W Quad-Core Desktop Processor BX80605I5760.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Any ideas on how to improve that list? Within the same price range.

If i dont overclock maybe the stock cooler will be sufficient?

All looks good mate you will have a pretty good system when your done. Well sandy bridges is coming but still this will be good for a while still.

Thanks everyone for your help! I really appreciate it  

No problem, that's what we're here for. It looks good and you can always upgrade the cooler when you decide to overclock. Hope you enjoy it.