not all dealers will, or even can, match the very best prices out there.
Re the ST suspension - if you've owned cars with sports suspensions before then you will find it anywhere between perfectly ok and on the firm side. But for someone who is used to regular setups yes it could well be too hard. Several long test drives on a variety of roads essential.
I wouldn't buy any of the extra crap the salesmen always push - apparently they often make more on these than the commission on the car itself but the reason is because it's practically worthless except in the case of GAP which is essential but massive overpriced if you buy from the dealer.