spyders, mmmm, er...
Nothing to stop you taking one out. I started NSPL this season withan automag. U just gotta be a very good shot as you will be outgunned by the more expensive markers. Someone once told me u can fit a timmy trigger to a spyder, but unless u can find a seperate trigger u'll have to buy a timmy to get one, so just use that as it will have better internals
what tournaments are you thinking about playing? That will be the main factor. Best thing is get urself along to a few walk on days and see how u get on with it.