hello im new to this forum so :beer: everyone

i know nothing about graphic cards and im looking to get a new graphics card, well something caught my eye, well this:

Leadtek WinFast A350TDH GeForce FX 5900 128MB DDR MyVIVO/TV-Out/DVI (GX-013-LT) costing £255.56

- nVidia GeForce FX 5900 GPU
- AGP 8X
- 400MHz RAMDACs
- 256-bit Graphics Core
- 450 MHz Engine Clock
- 256-bit Memory Interface
- Video In/Video Out
- TV-Out
- DVI Input

then the

Leadtek WinFast A350TDH LX GeForce FX 5900 128MB DDR TV-Out/DVI (GX-024-LT) costing £176.19

- nVidia GeForce FX 5900 GPU
- AGP 8X
- 400MHz RAMDACs
- 256-bit Graphics Core
- 400 MHz Engine Clock
- 256-bit Memory Interface
- 2.8 ns Memory Speed
- TV-Out
- DVI Input

why the big difference in price?

then theres the

Leadtek WinFast A300TD GeForce FX 5800 128MB DDR2 (GX-011-LT) costing £233.83

- nVidia® GeForce FX 5800 GPU
- 128MB DDR2 Memory
- Engine Clock 400 MHz
- Memory Clock 800MHz (400MHz DDR2)
- RAMDAC 400MHz
- Max. Display Mode 2048 X1536 X 75Hz
- Bus Standard AGP 8X/4X/2X
- VGA and DVI/I output
- TV-out port S-VHS & Composite
- Bundled with WinFastDVD, WinFox II, Cult 3D, Gun Metal and Big Mutha Truckers

this a 5800 costing more than the 5900 above it?

or should i forget the aboves and opt for these which is cheaper than the rest:

Leadtek Winfast A360TDH GeForce FX 5700 Ultra 128MB DDR2 (GX-021-LT) costing £163.33

- 475MHz core clock speed
- 400MHz RAMDAC
- AGP 8x
- 128MB 900MHz DDR2 memory
- DirectX 9.0 support
- 128-bit studio precision colour
- nVidia CineFX II engine
- Intellisample Technology HCT
- nView Multi-display technology
- Digital Vibrance Control
- TV-Out
- 1.9 Billion texels/sec fill rate
- 356 million Vertices/sec.
- CineFX 2.0 engine
- 256-bit Graphics Core
- 128-bit Memory Interface
- 4 Pixels per Clock
- Free Gunmetal DX9.0 Optimised game

then theres the

Leadtek Winfast A360TD GeForce FX 5700 128MB DDR (GX-022-LT) costing £126.31

- 425MHz core clock speed
- 400MHz RAMDAC
- AGP 8x
- 128MB DDR memory
- DirectX 9.0 support
- 128-bit studio precision colour
- nVidia CineFX II engine
- Intellisample Technology HCT
- nView Multi-display technology
- Digital Vibrance Control
- TV-Out
- 319 million Vertices/sec.
- CineFX 2.0 engine
- 256-bit Graphics Core
- 128-bit Memory Interface
- 4 Pixels per Clock
- Free Gunmetal DX9.0 Optimised game

agains a price difference!

so what is the DDR(ram?), and does the DDR2 make a big difference?