I really like the Gap linen one, definetey stalking it for a good sale. I also picked up a trendier one with light blue vertical stripes and navy buttons at Nordstrom Rack for a steal yesterday.
I do love the shape of the black Ann Taylor, but I feel wierd in black during the spring/summer, so I wouldn't personally do it just because of that strange color aversion I have.
F21 does have fabulous deals, but I would try one on in store because I find that the fit needs to be pretty good to pull off the look.