What 2TB hdd do I purchase to upgrade from 1TB?

hey there,

I'm new to this site, and nervous about opening up my iMac too, incase i do something wrong which would then cost me more than going to apple to do a upgrade..

i currently have a 27inch iMac 2.8Ghz i5 emc 2390 which i just upgraded to lion.

it came with the standard 1TB hdd and as i use it for everything from audio production to video and photo editing, i am running out of space.

i would like to upgrade it to a 2TB hdd which will give me the needed internal space.

i have checked my system and this is what i have:

Intel 5 Series Chipset:

Vendor: Intel

Product: 5 Series Chipset

Link Speed: 3 Gigabit

Negotiated Link Speed: 3 Gigabit

Description: AHCI Version 1.30 Supported

ST31000528AS:

Capacity: 1 TB (1,000,204,886,016 bytes)

Model: ST31000528AS

Revision: AP25

Serial Number: 9VP9B8E5

Native Command Queuing: Yes

Queue Depth: 32

Removable Media: No

Detachable Drive: No

BSD Name: disk0

Rotational Rate: 7200

Medium Type: Rotational

Partition Map Type: GPT (GUID Partition Table)

S.M.A.R.T. status: Verified

Volumes:

disk0s1:

Capacity: 209.7 MB (209,715,200 bytes)

BSD Name: disk0s1

Content: EFI

Macintosh HD:

Capacity: 999.35 GB (999,345,127,424 bytes)

Available: 480.44 GB (480,440,401,920 bytes)

Writable: Yes

File System: Journaled HFS+

BSD Name: disk0s2

Mount Point: /

Content: Apple_HFS

Recovery HD:

Capacity: 650 MB (650,002,432 bytes)

BSD Name: disk0s3

Content: Apple_Boot

so i think this is a seagate drive, so does it mean any seagate 2TB drive will work for my upgrade? coz i read somewhere on the site that i needed to get the same brand?

and how difficult is it to do this?

your directions and assistance is greatly appreciated.

thanks