what's the best thing i could do with my 24-inch, Late 2006 iMac? was wondering about using it as an external monitor (for a new PC), but that seems to require some electronics!

Updated the OS to Mac OS X Lion 10.7.5, but finding it a little sluggish, so thinking to buy a new 27" iMac, but then that would mean i've nothing to do with my current 24" iMac!

Ideally, would simply buy a new PC which could then plug-into the iMac 24" to use its screen as an external monitor - have read on the internet that this is only possible via opening the Mac up and repurposing it via electronics!

Spec:

24-inch, Late 2006

2.16 Ghz Intel Core Duo

4 GB 667Mhz DDR2 SDRAM