I'm going to be buying a new video card, either this..
Sapphire Radeon™ 9250 - 128bit 128MB DDR 8X AGP TV OUT DVI
Or...this
Sapphire Radeon™ 9550 - 256MB DDR 8X AGP TV OUT DVI

I want to buy the 256MB one, but my processor is 1.06Ghz right now, and my friend is like flipping out at me saying BUY THE 128MB ONE! the 268mb won't work, it will be horrible!...I don't know if he actually knows what hes talking about, or he doesn't want me to have a better video card then him...he has a 128mb one... He says that my processor will hold back my video card and make it almost worse then the 128mb one...I have a 64mb ATI Radeon 7000 right now...oh I have 512mb SDRam...So...Is this true? Will the 256mb run badly?? it will it run awesome? Please help lol....I need to know.
Thanks.

I just want to have smoother graphics on World of Warcraft and be able to play GuildWars!

I don't see that you would have any problem with the 256.

Specs here:

Detailed Specifications
Graphics Controller ATi RADEON 9550
Memory Configuration 256MB DDR/128-bit
Connectors 1 x VGA(D-Sub)
1 x TV-Out(S-Video/Composite Out)
1 x DVI
Bus Interface AGP 4X/8X
Max Resolution 2048x1536
3D Acceleration Features * SMARTSHADER?2.1 supports the lastest Microsoft DirectX 9.0 feature set, enabling cinematic quality lighting and shadow effects.
* SMOOTHVISION?2.1 delivers the sharpest, clearest textures without sacrificing frame rates
* 128-bit full floating point precision enables billions of color variations to render the same lighting and effects as Hollywood studios.
System requirements Requires Intel Pentium 4/III/II, Celeron, AMD K6/Duron/Athlon/Athlon XP or compatible with AGP 8X, 4X slot
64MB of system memory
Installation software requires CD-ROM drive
DVD playback requires DVD drive
500MHz minimum processor speed for MPEG-2 video capture
Operating Systems Support Windows 98
Windows XP
Windows 2000
Windows ME