What about the 24 mm Goon by 528 Custom? While it is not a 4-hole design, it uses a nifty and simple two-post clamp system that is an absolute breeze to build on. It is extremely well built, and costs only $60.
I prefer the Goon deck over the Velocity-style deck that has become pretty ubiquitous amongst two-post RDA's. Many others prefer it as well -- the Goon has quickly become extremely popular with cloud chasers because of its ability to securely hold pretty much any build you can think of. Low gauge 4-strand twisted coils? Rock solid. Clapton coils, Clapton coils, dual fused Clapton coils, staggered fused Clapton coils, stapled helix coils. Rock solid. All rock solid, even with dual coil configurations.
But even though it was designed to handle just about any exotic build you throw at it, the clamp system does not limit you to just exotic builds. At the moment my Goon has a dual fused Clapton build (2 x 24 gauge Kanthal core, 34 gauge Nichrome wrap), but right before that, I had a simple 3.5 mm single strand 26 gauge Kanthal dual coil mounted on it, and thanks to the clamps, each were held securely, without any danger of cutting leads since you aren't tightening screws down into post holes.
Run a Google image search for "Goon RDA builds", or check out the
Goon RDA thread to see the variety of builds this RDA is capable of.
Flavor is excellent as well, despite the large chamber and simple side airflow (3 x 3 mm air holes on each side, adjustable with a single-coil option).
It uses Kennedy style drip tips. The drip tip it comes with is a fairly wide bore but nothing huge. It is still plenty large enough to handle the airflow set wide open without adding any restrictions of its own. A chuff cap with an integrated super wide-bore drip tip is also available at a very reasonable price ($15 / on sale right now for $7.50).
The 24 mm Goon has quickly become my favorite RDA. I like it so much that I will be buying another one (or maybe even another two), so I can have Goons with different builds ready to go.
Anyone looking for an RDA that can chuck massive clouds while retaining excellent flavor, can handle anything from single microcoils to rather beastly exotic dual, is as easy to build on as a Velocity-style deck (and some say even easier), all at a very reasonable price, should definitely consider the 528 Custom 24 mm Goon RDA.