I'm not familiar with either speaker that you linked, but you may want to consider speakers from Proficient Audio in with your other choices. Proficient is a daughter company of SpeakerCraft and makes some really good speakers for the money.
Right now they have a promotion on their top of the line kevlar models which makes them an extremely good deal. The promotion is really designed to create higher margins for the dealers, but I tend to pass the savings along to customers. The sale goes through the end of the month so if you have a look around the web, you might find some good pricing from some of the on-line retailers. Feel free to give me a call or email as well.
Take a look at the Proficient W850... it's got a kelvar woofer with a cast magnesium basket and seems to have better specs than the other speakers your looking at.
These retail for $575pr and usually sell on the web for $250-300. During the promotion I can sell them for less than what's normally dealer cost which makes them a great value and nicely within your budget.
They also have in-ceiling and in-wall/in-ceiling home theater speakers that are part of the sale (C645, C850, C870, IW550, W690)... we're installing lots of the C645's for whole house audio.