$1000 each month is a good amount to invest, I suggest to go full on a single coin every month. Another thing, if you find yourself good with analyzing and find good ico, can go with investing on one month in between. This will have a diversified portfolio by the end of the year. The same will get a big profit, if there isn't any profit surely you won't end up losing.
This would be too much if someone just invest in 1 coin for whole month as its quite possible that market can recover and prices may rise in next month so the other coin you would buy will be at high rates . So better to buy few coins every month .