Well since the OP is thinking of a bigger mod, I'll throw in my $0.02
The Vamo is probably the best lower priced unit out there for durability and functionality. If you do get one, do yourself a favor and get it in stainless steel. I got mine from DiscountVapers.com. The stainless is a lot more resilient to scratches and even if it does take a little beating you can buff it out unlike the other finishes available. Also it matches most of the lower priced rebuildables.
The Natural is one of the less expensive mechanical mods. It's not telescopic so the sides are nice and smooth, you just unscrew a small section and put it aside to go into short mode, 18650 vs 18350. It's compatible with the same batteries that a Vamo uses. It takes more monkeying to get set up with the adjustable pins to hold the battery firmly etc. A definite go-to for low ohm
vaping and for pulsing out coils on stainless.
For 18350 batteries (Short Mode on either device) Go with AW IMR (700mah) or eFest IMR (800mah) batteries. I got mine on GotVapes.com but RTD sells them also. With the newsletter discount they ended up similarly priced.
For 18650 batteries (Long Mode on either device) Go with the Panasonic Button-Top Hybrid (2250mah) batteries. They hold a bit more capacity than AW/eFest and still allow for 10 amps of discharge safely. Also available on GotVapes.com and also on RTD.
For a charger, go with a NiteCore i2, available on both GotVapes and RTD. This charger is very reliable.
For a Rebuildable Dripper get yourself an IGO-L to go with the Vamo/Natural. It's Stainless Steel and matches nicely although the diameter is slightly smaller.
If you'd like to venture into genesis
vaping, go ahead and get yourself an AGA-T2 as well. Also Stainless, this one has the same diameter as both devices however.
For Wick, go with #500 stainless mesh or the silica wick available for 9.95 per 10ft at RTD.
For Wire, go to TemcoIndustrialPower.com and get yourself 32awg kanthal a-1 for an ego+IGO-S, 30awg kanthal a-1 for a Vamo, or 28awg kanthal a-1 for the Natural.
Best of luck!