SSDs are the biggest breakthrough in performance consumers have ever had. No CPU upgrade, RAM upgrade (aside from quantity) or other upgrade benefits the average consumer more than an SSD. The point is that CPUs have become very powerful, and now the challenge is to keep your CPU from spending most of its time in IOWAIT, waiting for data from HDD to arrive. One HDD seek can waste as much as 20 000 000 (20 million) CPU cycles, and that's just counting one core. (i used 10ms as seek time)
For that reason, a low-powered CPU + SSD works much better for the average consumer than a high-performance CPU + HDD.
This starts changing if you have specific needs. Only few people do video trans/encoding. If you're one of them, an SSD won't help here.
Also gamers might prefer spending money on CPU+GPU instead. Though there are exceptions. The most common exception is World of Warcraft, which does fairly random reads on its 20GB data files; an SSD can actually help FPS here since this game does not and cannot preload all data into RAM. So while other games read all data in one big chunk which works well on HDD, Warcraft may benefit from an SSD and improve user FPS. More RAM will help too, but that still means you have to play for awhile before all data is cached to RAM, an SSD will allow you to play without hickups even after a reboot.
So keep in mind average consumers who run internet apps and care mostly for loading/waiting time, which is bound by disk rather than CPU, while gamers and other specific users may have more benefit investing in CPU+GPU instead, rather than SSD. Determine your own needs and spend your money wisely, is my recommendation.
If you buy an SSD, then do wait a couple months. Two reasons:
1) there will be newer, better, safer, faster third-generation SSDs available
2) the existing second-generation SSDs will fall in price, making them more accessible to users wanting an SSD but waiting for prices to drop.
January-March generally is a weak quarter, meaning low demand and high supply = good prices. 2011 will an interesting year for consumers interested in SSD.