So I like to have a lot of Logitech products. Few problems I've had with them in the past so most of my peripherals are Logitech.
Mouse: Logitech G400s
Used to have a
Razer Lachesis, which got all sticky after cleaning it with an all-purpose cleaner (the rubber coating was coming off). Wanted an MX518-type mouse since those are pretty comfortable and this one came closest.
Mouse mat: Zalman MP1000
Wanted a mouse pad from cloth and nothing too fancy on it. This one was a reasonable size, but now I'm thinking about getting a larger one.
Keyboard: Logitech G15
Quite an old keyboard, but I love its display in combination with the
LCDSirreal applet, which allows me to monitor PC performance, TS info and a lot of other stuff.
Speakers: Logitech Z10
The display on my keyboard was nice, so why not on my speakers? The sound quality is great and I'm disappointed the product was discontinued so quickly, because they're awesome.
Headset: Steelseries Siberia V2, white
A couple of months ago my second
Logitech G35 broke (the earcups are attached very poorly), my headsets were getting expensive. So I toned down a bit and went for the popular Siberia. Sound quality is not as good as the G35, but it's a lot cheaper. The Siberia also has half-open earcups, so I can hear my gf when she's talking to me.
Monitor: Asus ROG SWIFT PG278Q
I LOVE this monitor: with 144Hz on a 27" QHD with height adjustment and swivel, everything's there
(Except for any connector but Displayport)! I use the G-SYNC option all the time, which you'll only appreciate once you've experienced it. FPS games with this monitor are godly. I used to have a multi-display setup, but since I'm no longer living alone there's not enough space for my other displays

. So I compensated by getting this large monitor.