2011 MBP Ram upgrade. 8Gb or 16Gb?

Hi all.
Well I've just sold my two Core2Duo machines and bought a late 2011 13" MBP. 2.4 i5 4Gb ram. I was always intending to upgrade the ram and then put an SSD in it.
I've done a fresh install and have noticed right away that it doesn't take many apps to be open to get the beach ball up (having forgotten what that was like with max ram and an SSD in the MacBook)
Now I was going to put 8Gb in initially, but I thought I'd ask opinions, as this is the first time I've used Mountain Lion so I'm not that familiar yet. Would 8Gb be enough for me, or do you recommend the 16Gb? I'm a graphic designer and use indesign, illustrator and photoshop, and the for my own uses I use iPhoto and iTunes and office occasionally. This is my personal machine, so I don't use it all day for this, just when I do any freelance.
I was thinking 8Gb along with an SSD drive in the future should ought to do it. In the UK, crucial have 8Gb listed at £60 and 16Gb listed at £100 for this model (1333Mhz Ram)
I know the intel 3000 card used ram for the graphics, and I will be plugged into an external screen also.
Thanks for your help and suggestions.
All help much appreciated.
Rob

I'm thinking of upgrading my RAM too. I have a MacBook Pro 15" (Late 2011 Model) with the following specs:
2.2 GHz Intel Core i7
4GB RAM
AMD Radeon HD 6750M 512 MB
As a 3D modeller and 2D illustrator, I use a lot of big software like Photoshop, Maya, Zbrush and Unreal 4. As much as I would like to upgrade to 16GB RAM, my wallet unfortunately is not on the same page with me. Is 8GB enough memory to run these software? And assuming I can afford the 16GB upgrade, can my MBP handle it?

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    Buffer B: 5163MB (5414836224 bytes) starts at local address 0x0000000243bfd800
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