Yep, mechanicals seem to be what most rba users seem to use....at least most of my pals here that use rba's use mechanicals....bapgood seems to have some success with rba's at 1 to 1.5 ohm on the 20d.....that would put it within the range of specified resistances that the 20d was designed for....thinking I'll grab a rba and follow bap's lead and see where it takes me.....and a dual dna12 is also a posibility.....
I've seen alot of new vape stuff since 2010 and I guess it's time to play a bit with a rba......will let ya know how it goes.....now gotta see which rba to latch onto.....have a great evening....
After further thought an RDA might be a good way to go to start experimenting with rebuilables and different wicks and eliminates the variable of vertical wicking.
There are a ton of RDA's out there, the IGO's seem to be pretty popular right now and fairly inexpensive. Something like IGO-L or IGO-W are kind of nice because they are a little bit bigger and give you a little bit room to work with. I have the L, but like the looks of the W better plus it has a third post so you could run dual coils.
Some really like bottom feeders, you basically get an RDA with a manual feed system.
As far as wicks go silica is probably the most universally used. Hemp seems to be growing in popularity, especially with tobacco flavored juice users. You also have bamboo, cotton, ekowool as "soft" options. Then stainless steel mesh and cable as metal options. Then you have ceramic. I think the only off the shelf ceramic currently available is the FC2000 stuff, I have been playing around with some white ceramic wick "BD13" that should be available soon. I love the flavor of the BD13, but all ceramic wicks do absorb a fair amount of heat along with some lag due to initially heating the wick. That may not so much be the case in an RDA with short wick, I haven't tried it but there are some I believe.
As far as wire goes ribbon seems to be the rage, I like using ribbon. I believe 0.5mm x 0.1mm ribbon is about equivalent to 30g and 0.8mm x 0.1mm ribbon is about equivalent to 28g. I have 28g,30g,32g round as well as both sizez of ribbon, all kanthal A1. I think 30g round 0.5mm ribbon would be a good place to start.
There are a ton of places to get supplies from, but
Kidney Puncher is pretty much a one stop shop for rebuildable supplies and their prices seem to be fair (plus they are fairly close to me so I get my stuff with in a couple days

).
If I had to give you a recipe to start with I would say something like below then tailor to suit:
RDA
- IGO-W
- 0.5mm ribbon or 30g round
- 2.5mm silica wick
- ~1.8 ohm coil
RBA
- RSST
- 0.5mm ribbon or 30g round
- Mamu Chimi wick or SS Cable or possibly Mamu Chimi wick using ss cable instead of mesh...but keep an eye on the ceramic
- ~1.8 ohm coil