Laptop - RAM upgrade

[ColemontHD]

I have a toshiba satellite with the following specs:

1.6ghz Celeron M
512mb DDR2 - 448mb after video share
80GB HD
64MB ATI video
wireless G

My question is, will just another stick of 512mb DDR2 help or should I go with a 1gb stick? I will be using Dreamweaver MX, Frontpage, Office 2003, Photoshop CS, and various other programs, sometimes at the same time. What is your opinion?

 

[ColemontHD]

Anyone?

 

[oynaz]

A 512 Mb stick would be a significant upgrade

 

[ColemontHD]

Would you recommend more for the software I am using. Also, what can I do about this cpu? I want a p4 M, any suggestions on that?