I do believe that windows is easier to use than osx.. I have had friends that have used macs for years- when I show them my setup, they are surprised how quickly and easily I can accomplish anything they can. I suppose this is debatable though..
I do think that windows computers are safer though. Microsoft has had decades of experience in working with malware- there are very many software suites that can easily deal with almost any type of malware.. Personally, I use Microsoft Security Essentials (yay for being free!) and I haven't had any issues in years. As opposed to (one friend of mine in particular) someone who uses a mac and doesn't even know that anti-malware software even exists for macs. apple isn't even so keen to advertise this either..
Cleaner, yes, I do think that it is easier to "clean" a computer and to keep it that way. I have dealt with registry issues on windows and macs, it is a simple process to keep it clean.
As for prices of solid state drives, I don't think that they will drastically drop in price in the near future.. I paid about $110 shipped for my sandisk 120GB drive. There are better deals out there nowadays though. I usually peruse http://www.logicbuy.com/
now and again and usually see a good deal pop up once a week or so...
A friend of mine recently bought an SSD for his computer- he too was waiting for them to get cheaper.. I'll let +Matt Anderson
tell you if he thinks it was worth it..