They have their quirks, but the last two FD Trinitron G1 monitors I've bought (21", can handle 1600x1200 at 95 Hz) serve me well for things that cost me $6 and $10. I can't be bothered to pay several times those prices for LCDs that still have some tradeoffs, though if one of you is willing to give me a 30" 2560x1600 IPS monitor just to get me to switch, I'll take it. (24" 1920x1200 IPS would be fine too, but no lower than that.)
As a work tool, I suppose my best computer-related investment is my HP 2730p. AFFS+ LCD, Wacom Penabled, lasts quite a while on battery (especially with a slice battery), and this one had the extra perk of having an Intel X18-M 80 GB already installed. The only big drawback would be the Intel GMA 4500MHD, but with convertibles like this, I don't have much choice.
But why is it such a good investment over my past two convertibles? I'd say it's a combination of the screen, the battery life, the light weight (for a convertible), and generally being free of paper notebooks. Can't stand working with paper for note-taking, but I still need a pen for math.
For something more recreational...hard to say. It could be my highly-modified Thrustmaster HOTAS Cougar + RCS pedal setup that I've had for several years, but I'd give all of that up if I had to lose my TrackIR 4 Pro otherwise. It could also be my vintage Stax Lambda setup (which is computer-related in that it stays tethered to my desktop), but I need more than a month to pass proper judgment on that.