1600k/hashes I'd say is plenty but, if you're going to solo mine any low difficulty coin you need to think long term otherwise you'll just end up with the same sort of money as if you were doing pool mining on a high difficulty coin, you'll only ever really make money off mining at all these days if you do long term trading with the coins you've gathered.
The people who made the serious cash with Bitcoin and Litecoin I reckon are the ones who built up their stash when the difficulty was extremely low and then waited for a year or so for a price rise to happen.
I wish I'm as positive as you are
Just stareted about a month and half ago and I'm mining some alt coins too as LTC difficulty has risen so much
Hoping it works out regardless
Tried a bit of trading but it seems I'm just too... noob for it right now lol. Cant seem to get it right