JP,
I don't know how long you have been investing, but attempting to reach an average of 24%/year (or the odd concept of 2%/month) is impossible. I haven't worked my numbers out for this month's Burrocrat thread, but you are one of the highest performers on the AT and you are averaging about 16%/year. with a risk of 8.7%/year. As far as I can tell you, wwwTractor and ContrarianJeff (although he has been out of the market the last two years) are in rarefied air with those kind of numbers. However, since we have 'friended' ourselves, I have to remind you that we do not have 2008 numbers for you and Tractor. Trust me, that would change things dramatically with the long term risk your allocations average. Your risk average seems to be around 15% - 20%. That means that without some very fancy footwork and lots of luck you would have lost about 30% - 44% in 2008. For example, for a big chunk of 2008 I was actually ahead by 4% in 2008 (but, see PoolMan - that stud) because I forsaw the dump. But I got back in when the market stabilized for some time only to watch my account dump 16% or so in the two days it took me to bail out.
Personally, I think a long term average of 8% - 12% is reachable as long as you can stomach C/S/I investing. Outside of that means that you are investing in a single fund (either the C or the S) and trying to market time all of the time out to the G only on the 2% declines that happen in some weeks/months. If you do that your risk is very, very high and you will likely bail at the bottom and be all squirrely about getting back in.
You have a great longish term tool in the AT. Just look at the great traders that bombed out by missing just a few moves. I will not drop names - but look at the 2008 AT and compare... Striving for a 24% return takes you way beyond any trader in history. Nobody hits that mark. Set yourself for 10% if you are young enough and plan you life around that result.