Well, look, instead of pulling figures out of the air why not just do the maths ?
1500/8 = what ? Still blame me for being 'snarky' ?
SATA uses 8b/10b encoding so the 1.5Gb/s is actually 1.2Gb/s or 150MB/s. Then theres additional overhead that means in practice you never reach 150, just as the Micron c300 can reach 350MB/s on SATA3, but only gets around 265MB/s on SATA2.
Here are some benchmarks of Intel SSD's on SATA1 and as you can see, Maximum sequential reads are limited to around 130MB/s, as I said.
http://communities.intel.com/thread/9812;jsessionid=5328108A8C844A733357EE1D98AE2D2E.node5COMS
quite often, If you take a look at some of the benchmarks in Anandtechs latest SSD article and
think a little you can clearly see that drives with phenomenally good 4k performance are not as far ahead of their competitors as you'd think, in fact on the heavy workload bench the Toshiba based Kingston Value drive is significantly ahead of the Indilinx drives and even the new Sandforce controller.
http://www.anandtech.com/storage/showdoc.aspx?i=3747&p=12
Without a doubt you'll notice a huge increase. Personally I'm not a huge fan of SSDs as I don't like the maintence involved but if you go for the 160gig X25-m keeping 50% free and ensuring that you don't overdo large amounts of writes to it (eg downloading needless stuff/torrents etc) then you'll be overwhelmed
If you kept up to date at all on SSD's, you'd know that things are nowhere near that bad. The x25's support TRIM and Intel has a nice utility for automatically scheduling TRIM's even if your OS doesn't support them. Intel Drives have great wear levelling algorithms, so you don't need to keep anywhere near 50% free, I keep around 10% free on my drive and it's only at 98% lifespan remaining (yes, you can check this in the SMART values) after 1TB of writes over 6 months. At this rate It'll last 25 years!
Torrent etc all you want, as long as you're not running a database on it or benchmarking 24/7 the drive will be obsolete well before you run out of writes.