please ignore the previous comment. picasa is useless for real photographic purposes - for storage of your holiday pics it's fine, but for everything else it pretty much loses it to flickr.

flickr is the #1 online photo site for a good reason. the 25$ per year, besides allowing you all the things you mentioned, will also let you:
- have unlimited storage (not 1gb, nor 20gb...)
- upload your pictures in their original size - a feature which for advanced amateurs and pro photographers is quite essential
- have access to the FlickrAPI which would allow you easily one day to build up a photo-blog or a dedicated site to host your galleries
- get to use the flickr tools (web and desktop) for uploading, managing and slightly retouching your pics
- access to the biggest ever photographic community

$25 per year is a ridiculously low price and I'm not even sure why you're still in doubt what to do...

compared to the average Bulgarian income, the amount is a bit high so I could easily understand the previous comment, but as an American you should know how much $2.5 is...