LouG makes excellent points in his reply to this.
BR22, what's your boot size?
The Riders Choice and the Agent are both good choices for an all around style riding board that you could also take in the park as well.
Honestly, there are probably a lot of boards out there that would work for you from the sounds of it. Have you researached anything specifically? What kind of board were you riding last? And what did you like and dislike abou it?
Those are good things to think about when getting your next board. You're already on the right track thinking about what you're planning on doing in the upcoming seasons and how that will play into the style of board you want to be riding.
Buying online is overrated. I've always thought there is something about the whole "shop experience" that is a part of snowboarding. But with the rise of internet commerce, those days may soon be gone. Your shop can be whatever you want it to be, although this kind of depends on the guys involved with the shop as well. It can be just a place you buy your gear, or it can be a place you go for knowledge and information, and also guidance in regards to many aspects of snowboarding. Not to mention a community of riders just to network, share good times with, and possibly go out and ride together.
You can't get any of that online, except for a confirmation email saying thank you for your purchase. Although if online is all you've got than that's understandable.
Elaborate a little more, and maybe you can get it narrowed down to a few setup choices that may work really well for you, other than a bunch of choices that may just be ok.