Here's my BMX.
I've got more money into it than I'd like to admit.
But it's worth it to me since it's tough as nails now, and way lighter than it was.
Some of the stuff I have on there:
Kink Cielencki frame w/euro bottom bracket
RNC Titanium 30 tooth chainwheel w/titanium bashguard
S&M Dive bars
S&M Redneck GFR stem
Haro Mirra seat
Drive Technologies 110psi Lock&Load tires
KMC K710 directional chain
Poverty sealed pedals
Snafu forged aluminum sealed 3-piece crank
Dia-tech Dirt Harry levers
Dia-tech 990 brakes
FSA Pig sealed headset
Kore street forks
The wheels are custom-made, the components are:
48-hole Odyssey Hazard hubs with a 10-tooth cassette rear hub (that means there is no freewheel, since it's built-in to the hub), 4 sealed cartridge bearings per hub (plus an extra one on the rear for the cassette)
13-gauge black anodized steel spokes
Velocity Psycho 48-hole double-wall rims.
Trying to swap out the forks soon, the ones I'm using are just too heavy anymore.
As for brands to check out, Hoffman is always good stuff, also check out Fit bike company, Kink, United, and We The People.
All good brands.