Gigabit switch - mixing 10/100/1000 with 10/100

The ethernet in my PC is "Gigabit" (10/100/1000) as is ethernet in my NAS. However I have a Netgear DG834GT router and a printer which are 10/100 (wired) along with three other PCs and a couple of SqueezeBoxes which are wireless. I am wondering whether mixing devices on a Gigabit switch would be possible?

What I want to do is plug my NAS and my PC into a Gigabit switch and then connect all my other networked devices into the router (wired and wireless) and only have the one connection between the router and the swtich.

I am hoping this will mean that the PC and NAS will be able to communicate at Gigabit speeds without being impacted by the slower 10/100 devices connected to the router. Am I correct?

Yes, you can mix n match.

Yes, and you may as well obtain a Gigabit switch with at least 8 ports (more if you might ever want to wire anything else like the Squeezeboxes).

By connecting all the wired devices to the switch, the router is just providing the internet connection and the Wi-Fi access point. The wireless and internet traffic together are unlikely to max out the 100Mb/s connnection between router and switch (but you could later swap out the router for one with 'N' wireless and at least 1 Gigabit port if needed).

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With that many bits of kit about I'd suggest a 16-port switch, save messing about later.