I've seen quite a bit of information on sharpening stones, much of which isn't really answering the questions I have. I currently would like to buy a couple "entry level" stones for my cheaper knives (Forschners/Victrinox). Is there a decent cheap system out there. I have some Wusthofs too. Thought I'd practice on my cheaper knives first. Is it essential to buy these $100 per stone systems? Also, what grit choices are best for cheap knives?