Combining 802.11a/g/b for multiple networks?

[sabka]

I have the following situation:

Office building w/ 2 floors. 1st floor has about 10 users - no networking, just broadband connection sharing.
2nd floor has about 4 users - also only connection sharing (no networking necessary).

I want to set up the two floors on seperate networks (this is a requirement).
I was thinking to either use 2 different frequencies (5 & 2.4 GHz) for 1st & 2nd floor.
Or maybe just use one frequency w/ different SSIDs (like 802.11g at channel 1 & 11).

However, I was wondering if there is any interferance problems I would deal with using two wireless access points running at differend channels?
Also, how could I assign multiple access points with the same channel (for range extension)? Is there interferance problems or is the hand-over between APs smooth?

BTW, I was looking into SMC routers / APs (possibly)

 

[sabka]

I think I solved this one myself.

Using different SSIDs I won't have interferance problems
Using same SSID, I can use channels 1,6,11 interferance free (for 802.11g).
802.11a has much more flexibility in regards to channel selection and hand-off.

Using multiple APs, I should just use different channels and set the client to auto-detect channel.

Thanks for all the help 😀