Your upload/download speed is determined by your ISP and only way to increase the speed is by seeing if they have a option to upgrade to a higher speed.
The SSD will help in read/write speeds and probably wont offer much in terms of processing, the processing speed will improve on upgrading your memory and processor.
I just upgraded my harddrive to SSD but when i edit photos and process them, I dont see a speed increase.
For some reason I thought I read somewhere a while ago that SSD's are not good for people who are downloading/editing/deleting files & pics non stop. Some weeks my wife will download/edit/upload/delete 2-3 gigs of info/pictures.