In walls can perform very well when installed properly.
I'd never recommend inwalls over enclosed speakers, that misses the point. The nice thing about speakers already in the enclosures is that the speaker engineer designed the enclosure to maximize the sound from the speaker. The bad thing is that they take up space. And to be honest with you, most speakers are just plain ugly!
So, if you go inwall, maximize the sound also. Either install the manufacturer's back boxes, or make them yourself. With your budgetary issues, making them yourself might be the best option. Most manufacturer supplied enclosures cost big bucks, then there's the shipping on a 40 pound box...
It's not very difficult to make enclosures, and it makes a HUGE difference in mid and low end. The nice thing about building it yourself is that it's easier to fit into new construction, and you can adjust the shape to fit the wall. Insulate it, seal it, and viola, a speaker enclosure. Always talk to the manufacturer or look for specs regarding the necessary volume for the speaker enlcosure.
It becomes a little more difficult if you need to soundproof the speakers to adjacent rooms, but it's not something you can't figure out. A little more money in parts, a little more time.
In my opinion, aimable speakers aren't really necessary if you pay attention to the linearity and off-axis specs of a speaker. Some speakers even 'tweak' the tweeter a few degrees towards the listening area already. With all due respect to Speakercraft, their contributions to our industry, and all their great products, the AIM series is marketing gimmick, not sound engineering.
That last (longwinded) point I'll make is that you want to try and get the most driver cone as possible, or, as many sources capable of playing bass as possible. If you can get your L and R with dual 6.5" drivers over single, do it. This helps with nulls a lot, instead of all low end having to come from one large speaker. In your surrounds, go with an 8" driver over a 6.5", etc.
PS. Bay Audio might not be a good option. They only sell to Custom Install companies, definetly not on the Internet.
How exciting, playing with other people's money!
