Are you kidding me? SSDs are awesome, and their price is very reasonable for their stellar performance. At about $1/GB, SSDs are now well within reach of virtually anybody buying computer hardware. Depending on the season, ~$100 buys you a nice 128GB Crucial M4 (they're $130 on Amazon at the moment, but they were as low as $90). You're not going to store your porn or music on them; you're going to store the stuff you want to load and run quickly, and for that SSDs are well worth the price.
All new computers these days should have their system drives (i.e. C:\ on Windows) running on SSDs. The OS won't use all that much space, so the remaining space should contain all your system applications and important programs. Then if you want fast-loading games, etc. you ought to get a second SSD drive for your games and other stuff you'd like to run without waiting. Games are, what, 8GB in size each? You can fit a lot of them on your SSD, and if you need more space, but another SSD for $100. I love how I don't have to wait at all for data to be fetched from the hard drive for maps, or saved games, or even just launching. No waiting for the drive to spin up, no loading pop-up, etc. It's a beautiful sight.
So many people who don't own SSDs just don't understand just how fast they are. It's like how a mortal can't comprehend how heaven would be like. People see the space numbers and think "oh buy I get a few terabytes of space for that price!" Well what really are you going to put on those terabytes? Movies? Porn? Music? That shit doesn't need speed. You could buy buy one low-power 3TB or 5TB drive for that content. Hell, you could store that mundane bulk data on a NAS or something over the network.
Most of that bulk data on regular hard drives lives out its life as just storage. You could just as well burn it to DVD because you will rarely even touch that data. Compare that against the the data and programs you use most often. The data you keep on your SSD is the most important data you have -- the stuff you actually use all the time, not that watched-once shit you have archived on that crappy 2TB Western Digital. You want that stuff loading quickly so that you can access it without wait.
SSDs are orders of magnitude faster than even the fastest hard drives in RAID configurations. I even benched my old Intel SSD I got two years ago versus a RAM-drive I bought prior (ACARD 9010) and the SSD was generally faster. They are simply that good. Some of the giant-cache hybrid hard drives are decent these days, but those are stop-gaps you pay extra for. Get SSDs for stuff your want to load quickly, and buy cheap slow bulk-data drives for your archival media. Segregate your data and you'll have a nice running system.
Remember that SSDs are the most cost effective upgrade for your entire computer, period. They transform 5-year-old laptops from clunky old machines into usable platforms. They obviate the need for superfetching or other tricks that the OS uses to try and make stuff load faster. You don't even need to use sleep or hibernation mode on your laptop anymore, because the OS is almost "instant on". You will feel more performance benefits from an SSD than anything short of bottom-of-the-barrel upgrades like installing more RAM from 256MB.