Boeriemore, I would advise you to just start off with the stock vivi novas, and as you get more experienced, figuring out what you like and dislike about them (remember to tilt frequently while vaping - otherwise you might get a slightly burnt taste), then you can start with the rebuilding (I rebuild them with cotton wicks, but cotton is finicky, until you get it right). Stock vivi's are great, you wont be disappointed.
By the way, for any review on most all of the e-cig products out there, check out Phil Bussardo's reviews at
www.tasteyourjuice.com He is the go to reviewer for most of the ecig world!
www.healthcabin.com is a wonderful place to shop for almost anything you might need, BUT recently they stopped shipping with china post, which was really cheap, now you can only use EMS and DHL, which is quite expensive.
You can try
www.madvapes.com I buy most of my stuff from them, great service, good prices and cheap shipping to South Africa (I generally wait about 2-3 weeks for a delivery - and they have a huge selection). They have the mini vivi nova -
Vision 2.0ml Slim Nova Tank Clearomizer, Smoke and the regular -
Vision 3.5ml ViVi Nova Tank Clearomizer, Clear
While you're there, check out there topvapor juice
http://www.madvapes.com/e-liquid/topvapor-e-liquid.html, very very nice, and again, much cheaper than most other places, and FAR cheaper than any crap Chinese juice you can get in South Africa. Before I started my DIY juice, I bought alot of juice from them (try rootbeer, minthol, ultamint and grandpas mix!)
If you're in the market for a new Ego, be sure to get the Ego Vision Spinner
Vision eGo Spinner 1300mAh Variable Volt Battery, Black from Madvapes, or the original Joyetech Ego Twist 1000mah battery
http://www.healthcabin.net/index.php?main_page=product_info&cPath=1106_1112&products_id=8044. I've got 2 of the latter, and they compare favourably with my larger mods (2 Lavatubes and an Evic). With these, you can adjust your voltage for more or less VTF (Vapor, Throat hit, Flavour - a term coined by Phil Bussardo!)
Good luck, and shout if you need help!
Vape on!