I understand your problem, but I fear that SSD is not the best solution.
I also have a 13.3" MacBook Pro (and had several other 13.3" MBs, MBAs). I upgraded the memory to 4GB and I also upgraded the HDD. I don't know about your laptop, but mine was already a bit noisy, so I thought that just as well I can install a 7200 rpm HDD. I purchased this one:
ST9320423AS,
http://www.misco.co.uk/applications/SearchTools/item-details.asp?EdpNo=374485
For £45 (around 72$), I have a very fast HDD. If I put my old one on Ebay, where these basic HDDs sell for around £25, the whole upgrade from a small and slow hard drive to a very fast one cost 20£ (around 32$). That makes sense to me. In the US or Canada, they might be even cheaper. Seagate claims that it draws only 1% more power and is hardly noisier than a standard drive. There is some extra noise, but not that terrible. Alternatively, there are some great HDDs from Western Digital.
With the SSD, however, you would have very small capacity for a lot of money. You could upgrade to SSD in two years' time, when prices will be closer to acceptable. But today, you pay around ten times more for an SSD. Can you really justify that? With HD content, that 64 or 80 GB fills up easily, too. My music collection is more than that on my computer.
From the 4GB upgrade, I assume that you have the basic 2.26 GHz version. I don't mean to be mean, but that machine is pretty slow. I know, because I have the same. For the first time, I bought the cheapest MBP as it was a temporary thing until Apple brings out something decent with a 13.3" matte screen. Then I will get a fast processor and maybe some more expensive options. But until then, I don't see the point of spending a lot of money on this 2.26 GHz machine. That is not to say that it's not worth spending some money on it, in fact the memory upgrade is vital, then perhaps the faster HDD that I was talking about above. But no sensible person puts a V6 in a Corolla. If you want a V6 or V8, then get a proper car first, THEN you can upgrade that.