Single pilot will make you a much better pilot. You are the captain, f/o, engineer, and dispatcher. When you make the next step to a 2 crew operation the toughest thing will be to let other people help you manage the plane.
Safety is up to you PERIOD. If it is broke, don't fly it. If you think the weather is too bad, don't fly it, like rotorhead said its all part of "gaining experience", you will just get yours much faster than a RJ f/o since it is only you making all the decisions.
Of course I am biased, 2 years of single pilot in single and twins, some of the best time flying I have had, but I do not want to go back to them............. at least not for the pay they were giving me.