Hard Sudoku Puzzle (and Solver Website)

I was trying to do this Sudoku puzzle without writing down anything other than the correct solution. That failed miserably, and even after I gave up on my "no scratchwork" rule, it still wasn't easy. I wondered if there was an website that would solve it for me, and of course there is. How difficult do you think this one is? Got a harder one for me to try?

2				7		1	4	3
	3			4		5	2
	8							2
3	6			2	4
		5				6	1
			6				3
		8
4					1			8

Puzzle 136 from "Sudoku to go" by Will Shortz (the NYT crossword guy)