I can't post my pics because of those dang memory constraints. I still have trouble compressing the memory requirements so I can post stuff.
Probably the easiest thing to do is post them on Flickr or Photobucket or something. Some of those sites will even provide the bbcode link to paste into your message. Otherwise almost any photo-editing program will allow you to resize your photos, and there are online services to do that as well.
The attachment limits on the forum are there to keep people from uploading enormous pictures that will both fill up the webserver and also throw off the forum alignment when it tries to display them.
The file-size limit allows for a reasonable JPG quality on images at 800x600 resolution, which is plenty for an inline image.