I have Early 2011 MBP with Corsair SSD and no Ram upgrade and I am getting around 10 seconds boot up and pretty much good surfing, video watching, browsinf forums and etc. Very decent at creating presentations with keynote and excels too.
You can push it a bit harder too with VM's which I do sometimes with VMWare Fusion and still get a decent performance. I would recommend adding extra RAM for that though. I am at 4GB and dividing them between MAC OS and Windows is not that good.
But when I push a bit with Firefox with multiple tabs, Facetime, Messages all together the fans go crazy but it doesn't slow down, maybe a bit but not rainbow loader for minutes kind.
I have over 1200 cycles of battery and still can get pretty decent battery life too.
If you can find a clean 2011, I say go for it.