Samsung 830 series is fast enough, a good buy for the money and Samsung has made a really good controller, which is even better than current sandforce, etc. drivers in "all-day-using".
Fast read-write perfomance on the box of a card is measured on generic tests/benchmarks, which do not happen in real life. In real-life usage, the Samsung are currently top edge! Top edge means not, that they are the best, but in current setups, currently used Sata, etc. Samsung did a great job.
I have mine for 4 months now and I am very happy, although I have an old mainboard, which only gives me SATA 300 speed. But in real-life usage, the SATA 600 sure gives u more performance, but in most situations, you are fast enough with SATA 300. I just said that, if someone has a SATA 300 as well (it is not so bad to have it plugged in SATA 300 until you get a new mainboard).
So, my recommeded SSD is currently the Samsung 830 series (256 GB i would say) with good controllers, which are currently forcing the other big brands to rework in their middle class range to reach the same! But nevertheless, nearly every SSD is fast enough, that u really feel it
-> And u get some interesting and easy to handle programs/goodies for it like SSD Magican (easy tuning with all needed suggestions you can find in tutorials for a good SSD performance, easy cleaning, easy and good backup programs, etc.) So, all you need to get it managed easily.