Thanks all of you for your clarifications. I have switched to 64 bit on both my desktop (runs on core2duo - 4GB ram) and on my laptop (i3 -3gb ram). No problem in performance and I am happy to add more gigs if i need it. But the provision is now there, which is a good thing.
and may be it's a placebo effect, just may be, but i have a feeling that both the computers are snappier now. it could also be because of MATE. I have a sneaking suspicion that MATE is better than Cinnamon, again, could be placebo effect! I am not a techie but I am an advanced amateur in technology :P
Personally I use i3 for when I need to get 'sh*t' done. Xfcewhen I want to play a nice game or watch a movie and when I want to show someone that Linux is a viable option on the desktop with nice eyecandy but still more productive than win8 I show them gnome 3 or cinamon. So most of the time I use i3. I can't imagine being productive at writing code or reading and learning without a tiled window manager. Having said that, if you have less than 4 GB a 64bit install won't do you that much good. The great thing about linux is however, if you have a 64 bit install and system, you can still use 32 bit libs and compile those (or just download the bins) tools/programs you need. 32 and 64 bit software live together on my system. Then again, i have been using linux since 1998 and worked for SuSE. Later I switched to Debian, which I still find 'the distro', but since about 2 years I have switched to Arch since I love the rolling high-tech releases there. However, that is not something that I would recommend as a first distro.
There are so many great chess tool on linux. They have all been named, scid for example is a great tool. For a quick game of chess these days I use pychess. Great little program, and even greater since it's written in python and python is fun to code at :)
However, for the average user, you want a 64 bit system so you can adres more than 3 gb of memory.