Buy a 5400rpm secondhand drive I have one that works intermittently, I'm happy to swap it to you for the soul of your 1st born. I'll even chuck in a set of steak knives, what a deal eh!
any toughts on what brand. Hellhammer said that X-25 have no problem with mac but only 1/2 speed of avg SSD's. but if i buy other brandi may have trouble. hmmmm -_- which brand i should buy?
Intel is more reliable, OWC and OCZ have the highest overall performance. Corsair is fastest in some limited scenarios. So, Intel, OCZ or OWC for most users. It just depends on what you want.
And, the Intel isn't half the speed. It is more like 90%.
Regarding the hybrid hard drive you mentioned earlier its a decent choice. They do offer some nice advantages over a mechanical hard drive however with only 4 gigs of flash memory the advantages are limited compared to a entirely solid state hard drive.
Many users will purchase a low cost SSD with an Optibay and replace their optical drive with it. This allows them to keep the large hard drive they already have for storage and use the SSD for programs and the operating system. You probably already know about this but I thought it might be worth mentioning.
Mercury Extreme or a Vertex 2/3.
Both have SandForce controllers so TRIM on-the-fly, which is a bonus considering OSX doesnt fully support TRIM yet.
Had my Vertex 2 for around a year now - no issues whatsoever, and just as fast as day 1.