Hubbytuby, what Mdocod said hits the nail on the head. You can spend hours here wondering what would be the best.
I am going out on a limb and going to give you two choices, both featuring the original
M@g mod that reallys started them all off.....AND is still a wonderful flashlight to use impressing neighbors or actually to use to find something at night.
Introducing the ROP. You have two choices, a 2 D or a 6 D.
For the 2 D, most people would get an aluminum reflector (FiveMega's is premium but there are others too that are fine), a borofloat lense (search for that here too), a 6xAA battery holder FM's again...premium), and some good AA rechargeable batteries (recommend Eneloop..again, do a search). Ops, ROP bulb.
For the 6 D, the reflector, lense, same bulb this time with 6 rechargeable D batteries (I recommend AccuPower Evolution LSD's for max runtime).
The unfortunate problem is rechargeable batteries. If you are going to get into this hobby, then go ahead and get a really good charger now and do not waste money on some cheap crap charger only to throw that out and get a really good one later. It is worth the money to do AND there is nobody on this forum who will tell you that paying good money for a good battery charger has NOT aided in their flashaholic pleasures. Go to the Batteries forum and search around there for ideas for a good charger. Think NiMH for now, there are Li-ion (and clones) batteries too, you just don't need to play with them yet.....stick with the basics for now.
Hopefully, that is as simple as it gets. Once you get into the higher power incans.....get AW's replacement switch. It soft starts, and has three levels....again, premium equipement for beautiful flashlights that you (we) build ourselves.
Bob E.