If you like the analog then the casioak is an excellent choice. It's a global hit.
Keep a lookout on flipkart for the military green solar casioak. It was selling for just arnd 8700/- a couple of days ago with fk coins. It's showing a higher price now tho.
Take a look at this CASIO...
Can't go wrong with the Casioak you liked. Also the Gshock G5600ue-1dr tough solar (costs abt 5300 on Amazon. Currently out of stock) is similar size as the black gshock u chose.
I have both these and they look great on thin wrists.
I use the 8" Wakefit Elevate pocket spring mattress. It's available on Amazon 10 year warranty.
I used to wake up with a backache everyday when I used a coir mattress.
The wakefit elevate has sorted out the backache issue permanently