I'm still using three Lian Li cases that I've had since the early-mid '90's (two in my house, one at my sister's). I did buy a new one recently; but only because I wanted to put significantly more stuff in a single case -- more than would fit in any of the three I already had. I could easily have spent less and accomplished the same purpose. The Lian Li's are clearly an esthetic luxury I could have done without.
My MX500 mouse lasted from about two months after its initial release until earlier this year. I don't even know how long that's been. I was devastated when it died that it had been discontinued. I tried a G5 laser mouse & didn't like it. Then I got the MX518. Love it! Hope it lasts equally as long as its predecessor. (I bought an extra one simply because I like it so much, I don't want to be without should Logitech discontinue it.) Considering how much use it gets, having the right mouse is not a luxury -- it's a necessity.
I've got two AT keyboards and a Northgate keyboard (the one with the extra set of function keys). I wouldn't give them up for the world. I recently added a Das professional keyboard. With all the millions of actuations the switches in these things are designed to handle, I doubt they will ever wear out. Money well-spent.
Early on, I went through a number of inexpensive speakers for my computers. Then I fed the output of the first serious sound card I purchased through my home stereo system. I was hooked. Unfortunately, it really isn't convenient to work where the sound system is -- to many distractions. In my quest for the perfect computer speakers, I found the Klipsch ProMedia 2.1 model. I have now purchased 4 sets of them -- 2 for computer use and 2 for powered, external speakers for television use. A luxury, yes, but still, money well-spent.
I make a living with my eyes. What I see is important. And it is important that I see accurately. I'm a photographer. My work depends on detail -- not only the detail of what's in the image, but also, the detail of the image, itself. For that, I need accurate tools. That means top-quality glass. I spend major cash to get the best lenses. Among my arsenal of choices are some of the best lenses Zeiss, Schneider, Nikon and Canon have ever made -- none of their consumer "kit" lenses. Lenses last far longer than the SLR bodies to which they attach. I'm still using lenses that I bought thirty years ago. And I'll still be using them thirty years from now (if I'm still alive). True, I also buy new lenses from time to time. I buy the tools that fit my current need: tools that help me capture the image I need -- fisheye, wide-angle, portrait, macro, tilt-shift, telephoto. These lenses are the tools of my trade -- not luxuries.
In these days of the digital darkroom, the monitor is part of the optical equation. If it can't render color and detail accurately across the visible spectrum and with exceptional linearity, it becomes the weakest link. Spending money on a quality monitor is not a luxury; it's a necessity. If the NEC 20WMGX2, the HP LP2475W and the Dell U2410 didn't exist, I would be buying top-of-the-line Eizo and NEC professional graphics monitors at two-to-four times their cost. That these three monitors are as good as they are makes them a necessity -- regardless of their cost. That they cost what they do makes them bargains compared to the alternatives available. And, they will lass far longer than the computers to which they are attached. My eyes and my customers deserve nothing less.
pc-v600b, ss-860xp, max V gene, 3770k, 4x8gb ddr3 2400, i520 240gb ssd (os/apps), i520 480gb ssd (workspace), 2x3tb wd30efrx (raid-1) & i525 60gb ssd (cache), 2x GV-R795WF3-3GD, 2x u3014, leopold/cherry brown kb, g400, intuos5 pth650, win.7.x64.ult