I've gone for a full set before back in 2005/2006 - 2008 and ended up selling due to varies reasons when I was so close to the end. If I don't set myself targets to complete the set I will probably never do it, or if I do the prices of games will go up even more!
The only game I'm worried about finding is smurfs 2 but the rest are easy enough to find (with championship hockey being the possible exception)
Should be easy complete by the end of the year!
Edit* the plan for the hard ones are to buy them as I see them for a good price, pretty much all the titles with the exception of the 2 I mentioned are on eBay in one country or another so could easily get them but no rush - I have 9 months to get 20 something rare titles out the way