FINALLY got tack of my own. Had my mare for 9 months... figured it was time. Here it is!
This is a Stubben Siegfried, 17.5" 30cm. Heard great things about this saddle and found one local for a great deal. A couple of buddies and my instructor has been helping me out with fit. It seems to fit us both well- even sweat spot on her, 3 fingers fit over the withers, sits in place and doesn't rock around even without the girth or pad, etc.
However, looking at my horse tacked up, the pommel is quite higher than the cantle. Another instructor of mine suggested that I scoot the saddle back and off of my horse's shoulders more (I completely agree with her, it looks too far forward) and also suggested that I get a hunter pad instead of this dressage/all-purpose pad and to also look into a riser pad.
Unfortunately, my knowledge of tack is very limited! I have a lesson tomorrow so I'll bring these things up, but would love input or advice from people here as well!