Any opinions out there?
My 32 HAC is the perfect size for me, but it's quite similar in size to the 35 birkin. If I were looking for something a bit different and maybe slightly dressier (because it's less bulky), I would consider a 28 HAC.
 That said, I guess it would also have to depend on which leather and which color(s) we're talking about. But if I had to choose between a 32 and a 28 of the same leather and color and hardware, I'd choose the 32 in a heartbeat because it's the best size for me. I'm 5'7" and I tend to carry quite a lot around with me during the day.
I'm just a leeetle bit shorter than you are, Gina -- well, actually a lot shorter. I'm only 5'2 (and a half...). The bag I am thinking about is ebene fjord -- and the 28cm might be better because fjord is so much heavier. I have a 35cm birkin and am waiting for a 30cm to come in.
Oh! In that case, I'd say go for the 28 HAC. A 32 HAC and a 35 birkin are quite close in size, so you might appreciate having two completely different looks.
And you're right. If the bag is in fjord, then 28 would be much easier on your arm!
28cm hac is pretty small. Its like a 30cm birkin.
I would recommend the 32cm hac as a first bag
I recommend 30cm Birkin over 28cm HAC. If you want something in small size...may be 25cm or 28cm Kelly...?