I'm relatively new to spey casting; started winter season of 2016. I agree with Brian, and Bjorn the smaller spey rods (3-5 wt) are harder to cast on than the 7wts and up. The smaller rods take discipline to keep things inside the box, and better timing. You might consider an inexpensive 7130 or 8130, get the basic moves down, then buy an inexpensive trout spey. You could probably find both those pieces on this board for around the price of one new rod.
That said, I wouldn't get too wrapped around the axle over finding a rod that is just right for you. At this point, you don't really know what you like or want in a spey rod action or feel. I think it's more imortant to learn what a 'successful' spey cast feels and looks like with any gear. If you're set on buying new, go to a reputable shop, tell them how you want to fish with it. You'll wind up with a matched rod and line. Then fish and practice your brains out with it. Doesn't matter what gear you buy if you don't get it wet at least twice a week for a few months.
Most of all, have fun, enjoy the process and be safe. Start w/o a hook until you have high confidence in your ability to keep the fly away from your body.