I'm really sorry to hear you lost your wife.
I have recently moved from PCs to an iMac.
I had worked with PCs since before Windows came out, and used them for work, and latterly for music and photographs.
November 2010 I bought a 27" iMac, along with one-to-one training for a year.
Had I wanted to surf the Web, handle pictures, movies, write books, create personal web sites, plus a host of other things - without needing to coordinate with people using Windows, and with applications I used on Windows - then it would have been brilliant. The need to interlink with Windows caused a host of challenges and cost money. I guess my age and a seemingly similar interface that was annoyingly different didn't help.
The ability to run Windows on the iMac as well as the native OS X operating system was critical, and I bought something called Vmware Fusion 3 that enabled me to run Windows at the same time as the Apple software. Usually you choose one or the other at one time using a thing called Boot Camp. Hey, I've been a computer professional since 1965 - I'm used to complexity. Possibly that has been a problem because I initially overcomplicated my use of the iMac. It didn't need to be that difficult!
Now, there is one final Windows product that I use that is not available on the native Apple software - Family Tree Maker 2012. Next week it is released in a new version that is apparently very good. There was an existing version but it had bad reviews, and was not compatible fully with the latest Windows version I have been running.
I don't say anything above to turn anyone off Apple, because now I have made the jump, spent the money and more importantly the time, I would never go back. Never have my pictures and music been so accessible. Never has it been easier to do things.
The computer is so fast without the need for anti virus software, and I really don't like using Windows any more. The large display is fantastic.
I'd recommend going for an iMac if you can afford it. Put Microsoft Office 2011 Home Edition on it if you want decent word processing and spreadsheet.... or buy Pages and Numbers from the Apple Store [there's a legal way to get them cheapest there, much cheaper than the way they initially show them].
I recommend you buy an external hard drive and use it for Time Machine - automatic backups invisibly. Digital photos are irreplaceable.
You probably won't need to buy much extra software - the iMac will have it all.
I do recommend the one-to-one training [it is cheap and you can book as many sessions as you want or need] but only if you have an Apple Store nearby. There are some great books available to help - look at the Missing Manual range on Amazon and download the ones you need to a Kindle app on your iPad, or load Kindle on the iMac, PC or phone and use it there. These books have enabled me to bridge the gap in changing systems.
In summary:
Plus
If you are not in a working environment, there is simply no choice - Apple every time
Minus
If you don't have the money, then PCs are much cheaper
In my experience, most people are down on Apple products because they can't afford them, and probably haven't had the opportunity properly to try them. iMac, iPad, iPhone, iPod are all extremely good products.
Good luck!
P.S. I have NOT just started a new job with Apple!!!