The in ceiling speakers are aimible, I was going to aim them to the listening area.
http://www.avhifi.com/shop/Speakercraft-AIM5-One-In-Ceiling-Speakers.html
Yeah, it depends how serious you are. Speakercraft is a good, reliable brand, great for whole house music on a budget. I generally recommend against them for home theater, though.
The cost for inwalls is as much the work of putting them in and running the wires as it is for the speaker. It is possible to upgrade, but, the trouble is much more than say a regular bookshelf. Generally when people try to budget on the inwalls for a main system, they end up spending more later.
I'd recommend looking at Triad for in-ceiling speakers:
http://www.triadspeakers.com/
They will require you to drywall over them, but they are aimed at 45-deg and a very nice sounding speaker with an inert cabinet. The grills are also nice and flush, plus paintable.
If your budget is firm, you could also put in the Speakercraft in-ceiling speakers, and then if you aren't happy later, you could always use them as height channels if your receiver supports that (or will in the future), and then get some larger main channel bookshelf speakers.
@MidnightSensi - nice setup. Was it easy to route your cables behind the baseboards? I am going to do that when I do the floors in my living room.
Thanks! It's actually cleaner now (the cables running down the front aren't exposed anymore). My front wall is actually concrete, so the lower part of the baseboard is actually a painted C-channel. I have system "ADD", also, so all I have to do to run new cables or route something different is pull off the channel, run the cable, and then push it back on. It sort of blends with the actual baseboard.
That channel is actually pretty big because I run very large speaker cables, but a much smaller and lower profile (nicer looking) channel could be used if you use typical 12-14awg cable. The smaller ones blend so well with baseboards that even if you walk right up to them it is hard to tell... mine you can sort of see it isn't part of the baseboard.
That said, while you have any walls open, run cat6 and speaker cables all over the place.
I don't have a picture of it now, but my rears the cables are run through the wall to a nice looking junction plate. Then a jumper cable is used to the speaker. Looks very clean. If you ever did bookshelves wall mounted, having the cables behind the wall in case you need them would be very advisable, then you'd just cut the wall and put a plate there. If you never used them, so be it, the cable itself is cheap while the wall is open.