Looking for one to cut a few (not many) relatively thin concrete slabs.
Never used or owned one before, so don't know what to look for. I thought
that a 4.5" would be ok (will it?), and just buy a big pack of stone cutting
disks from Screwfix - they look cheap enough.

The ones below seem ok to me. Any recommendation? I suspect that once this
job is done I will not be using it for more than a couple of times a year.

http://www.screwfix.com/app/sfd/cat/...12131&ts=54887
http://www.screwfix.com/app/sfd/cat/...65546&id=50168
http://www.screwfix.com/app/sfd/cat/...65546&id=87881
http://www.screwfix.com/app/sfd/cat/...65546&id=87881

Any tip will be much appreciated.