if you're on a budget, you can do it for way cheaper if you do it yourself and skip the flasher bulbs. flashers are about 10 times the price of your general 44 bulbs, which is the bulk of lighting in most machines. also, sometimes you just have to experiment with what works best (frosted vs clear, concave vs regular, single LED vs multiple LED).
i've mostly used ablaze LEDs from pinballlife.com. they a nice an cheap, but don't seem as bright as others, especially the frosted. 555s sometimes need some tweeking on the leads to get them to work right.

that's the other thing about kits, you get what they give you. if you want to tweek and adjust stuff, you'll just have to buy more bulbs.