Hi Aaron, Given what the reflex already has, and the fact you mentioned the BW bolt kit the first thing that comes to mind is a Boomstick if you don't already have one.
If so a full set of backs for various paint sizes is the next step. Correct sized backs to suit paint are awesome for achieving straighter, consistent shots with low fps variance at a fractionally lower air pressure while still sustaining the FPS.
Question you should ask when gettin a Super Freak kit is, do I need a Carbon Fiber tip, an Aluminuim tip, and an Apex tip? I'd say the vast majority of people don't.
So you can go two ways from there really depending on what you need. If you just want a couple of more bore sizes to use should you need them, a couple of extra barrel backs for your existing system will do you fine. If you want the diversity of a Freak kit, but without the clutter of extra barrel tips that won't be used, then an original Smart Parts Freak kit is the way forward.
Get the freak kit with a freak front and spend the money you want to spend on fancy barrel tips on more inserts. The tip of a paintball barrel is arguably the least important part. Don't let the internets talk you into spending money you don't need to as a new player. Also, yes the Empire stuff does work with the freak. They used to make their own freak style system if I recall correctly. Once you get the kit you will learn the magic pressure you need to blow paint through the bore insert with your mouth to get the best match. You will never go back. (Pun intended)