You want to get a better performance machine? Upgrading to a SSD (Solid State Drive) will make you see (and feel) good numbers in the benchmark comparison with a regular spinner hard drive. Applications will open faster, your OS will be running healthier and your overall experience will be a snappier one. So back up your drive, invest on a SSD and see what MacBook Air owners have been emailing about.

Patriot Wildfire 120GB
This brand's first experience in SSD is a good one. Fast writing time and zero crashes. Impressive speeds of 555MB/s that provides a good performance. Fast date rate speeds means better user experience. You can get one at $239

Adata S511 240GB
At this price, you have no excuse to not upgrade to a hi capacity SSD. With speeds of 500MB/s. It's a 2.5" dryve that you can pretty much fit inside any machine you may have.

Samsung SSD 470 256GB
The cheapest of the 256GB club. Around $384. You can cut your computer's boot time in half with this high performance SSD. Nice brushed aluminum finish that protects the drive against rust and shocks. No moving parts means great battery life too.

Kingston HyperX 240 240GB
Speed rates of 525MB/s in read and 480MB/s write. Longer life due to the fact that it has no moving parts (remember they are like RAM chips stacked together!). Reduces load times in applications and great transfer speed of files between desktop folders. $483 may not seem cheap, but the performance's gain will be forth it.

Sprout Side Table
Why would the need the
Samsung SSD 470 256GB to be protected from rust?
It's that performance or capacity argument that I face. I could go for a performance upgrade since my boot time when upgrading to Lion has doubled. However I can only afford one that would demote my HD space to half of what it is currently. Decisions, decisions.
I don't see a point in throwing tons of money at a SSD over 128 GB yet. Go smaller and put your OS and any apps that you want to load super fast on a SSD. Buy a regular HDD 1 TB or larger for storage.
I've been using one at home for a couple years now, and just convinced my boss I needed one for work - I'm using the 'wildfire' model listed above +++super good. The performance difference is substantial. My boot times have gone from 2-4 minutes to less than 20s. I agree that more than 120/128 right now is venturing out of the good value zone. It doesn't make any sense to put your movies or other storage on one of these. Unless you've got over 100 gigs of apps (which is certainly possible if you are a gamer), save your money and get a smaller one.