Thanks everyone for your advice thus far! =)
Taking everything into consideration...I would probably just keep my azur 30 and get another speedy in size 25...except for a slight problem. The damier azur is very prone to denim staining; not knowing this at the beginning, I wore my speedy with a new pair of unwashed jeans and ended up staining many areas of the canvas and the leather! To make a long story short, I followed someone's suggestion on this forum and used oxi clean to try and clean the canvas. What a mistake! I'm not sure if it's because oxi clean actually has traces of blue in the detergent, or if the blue parts of the checker pattern actually MELTED off of the canvas...but either way, some blue dye has definitely seeped into the leather of the piping (near where it's stitched to the canvas) and I can't get it off (and no, this isn't the dye from the denim either).
*sigh* I'm really anal, so I'm thinking of selling my speedy on Ebay and just starting over from there (the bag is in immaculate condition except for the stained part in the piping). I'll lose some money of course...but I really have my eyes on the damier ebene speedy 25 and the mini lin ebene (which only comes in 30). If I end up getting the azur again, it'll be in the 25.
Hopefully, I'll be able to sell my current speedy for a good price!