If you are pleased with your laptop, then perhaps you don't need a duplicate PC anyway.
But if you do, then a new tower PC isn't going to cost a fortune these days, especially as you won't need a replacement monitor or keyboard.
I use my desktop most of the time. I bought a super new monitor for it last year, a 23 inch jobby from Tesco and now I find that I can watch TV on it as well, using the BBC iplayer, on this lovely new site I have just found :::
http://www.tvcatchup.com/
You can watch pretty much any channel you, LIVE, for free !