Modded GTA IV low fps for my specs?

[V8VANTAGE]

I admit my GTA IV (1.0.0.7 Steam) is modded but I believe I'm getting a lower fps than what I should be. Would upgrading the graphics card help at all even though it is a largely CPU dependent game? I was looking at selling my inno3D GTX470 to get a GTX670 Direct CU II.

 

Im not expecting 50-60fps but it seems very low indeed.

 

These are all the mods I have installed:

 

- City Cars Pack V1.2 (I think its called - only pack I found which doesn't spawn taxis everywhere)

- Latest version of IcEnhancer (I have disabled forced Anti aliasing)

- Ultimate Textures 2.0 + all currently available HQ texture packs for Manhattan Island by Lord Neophyte

- Explosion Mod (makes explosions larger and more powerful)

- Realizm IV (latest version)

- First Person camera Hack

- Traffic Flow Mod

 

These are the settings I use:

 

- Resolution 1920x1080 (60Hz)

- Texture Resolution High

- Water Resolution - Very High

- Reflection Resolution - High

- Shadow Resolution - High

- Night Shadows - Off

- Anisotropic Filtering 16x

- All Sliders are on 50/100

- Definition On

- VSync Off

 

- Clip Capture Off

 

And here is my PC:

 

Win7 HP 64Bit Sp1

i5 2500k - 4.4ghz

8GB DDR3 1600mhz

GTX 470 1280mb @ 700/1700mhz

Antec EA 650w

 

Here are some pictures captured with FRAPS (my FPS readings are in the top left)

 

http://imageshack.us/g/821/gtaiv2012083115490774.png/

 

Many thanks to any help given

[cal0006]

Switch off Shadows (or set to Medium)

 

I'm currently having a problem with shadows if I have ENB series enabled. Trade off is slightly crap shadows for moderately good FPS.

 

Need to find a fix though.