There are TONS of lights out there to go with. There are several questions you have to ask yourself though to determine what will fit your needs.
Size, battery, battery life, brightness, modes, waterproof, bombproof...
When I answered most of those questions to my satisfaction, I really liked what the Fenix LD10 R4 had to offer (& now there's an R5 with some pretty good stats). It's a decently small light (It's just a hair over 3 7/8" & about 7/8" wide), fits my hand nicely. It runs off a single AA (easy to find & pretty inexpensive), 34 hour run time on low, max of 132 lumens(the light it throws lights up a room well and lights up a darkened street well.), comes with several different modes (low, medium, high, SOS, Turbo & Strobe. Oh, and those modes are super easy to cycle through), It's waterproof to IPX8 standards (means nothing to me, if I can drop it in a body of water, pull it out and expect it to continue working flawlessly, then we're good), and it's made of T6 aircraft aluminum with a hard anodized finish. Seems tough enough for me.
I've had it for around a year and have used it frequently. When I purchased it, it came with a holster, a clip, a lanyard, extra o-rings and an extra tailcap switch rubber. It's well under $100, even the new R5 is around $55.