suggestions for DIY surround speakers

[jerix]

I am planning to do a DIY surround speakers to replace the big BS speakers i have right now. I will just use my big BS speakers for my other amp. I have already set my receiver's speaker set up to "small" so my 2 subs will process the low frequencies.The surround output of my receiver is 120w at 8 ohms. So I believe the surround speakers should also be 8 ohms. I plan to do a 2-way system.

My concerns are the following:

-Type of drivers I should get;
-Size of drivers;
-Connecting the driver and the tweeter to produce an 8ohms speaker.
-Size of the box.

Thanks.