As mentioned above, the search function is your friend, there are plenty of reviews from knowledgeable members.
I purchased my first sub from a TD after some research here and all I can say is that you will find everything you need, unfortunately its like a disease I have gone from a $250 rep to a gen in the space of 5 mths
I would hasten to add that I would probably suggest a M2M sale for under $300, it may not be brand new but you will have the knowledge that a member has previously done all the work and you can get an accurate report on the way it is running etc...
Obviously with the above you still need to do your homework and 'buy the seller' but there are plenty of good people here to help