I think I bought that set too Kane!
Here's my not exhaustive list, I'm always buying extra things to try them out:
Get very good quality tweezers (U-star make some good ones, the Tamiya are excellent) including fine point.
Get some reverse action tweezers - Ive now got six, started with two - they are brilliant for holding things, glueing together, put aside while you work on something else and of course painting. Theres a mob in the UK I buy mine from
http://www.ebay.com.au/itm/190499838024 ... 1439.l2649
An LED magnifier ring light for close up work (try your local crafts store, e.g Lindcraft) and as much overhead lights you can afford/put in place.
Stationery file organizer to file away all the little odds and ends - I get mine from Big W at $17 a pop, have 3 and they are very handy!
Tamiya masking tape - best stuff - plus get some micro tape, in 1mm width too. Makes canopy masking a snap.
Fillers: Mr Surfacer 500 and Tamiya Putty will do 95%, have some acetone/nailpolish remover at hand with cotton buds to do cleanup on seams.
Applying superglue - I use the Flexifile CA applicator, irreplaceable for fine jobs.
Pipettes and tattoo ink cups - get these by the 100 bag, just cheap pipettes to measure out paint etc without spilling and little 3ml and 5ml ink cups that tattoo artists use to mix your paints or small pigments etc. Cheap as from ebay and save a lot of mess and you can really finetune your mixes.
Paint pallette - plastic will do - any craft store or ebay will have a cheap one. Immensely helpful in doing multi weathering at once with different pigments, pastels and washes in the paint holes
Business cards - I use these to put a dob of super glue or something else toxic or not on for small jobs instead of my cutting board. I have 1000's of these from prior jobs, they are really handy.
Glues: Tamiya extra thin for almost everything, Tamiya Cement (with wide brush) for large bonding surfaces and get a variety of different super glues - gel, liquid, fast, slow. Also UV glue from Japan for glueing clear parts if you can get it - Lee/Paul did a review on this recently, I still cant get it!
Pin vise and drill bits: get a good quality set of drill bits and you can drill out exhausts, gun barrels, lightening holes etc etc and do a lot of detail work for not a lot of money
Kitchen magnetic strip for tools: can find these at good kitchen outlets, its a great way to clean up your bench and have your main metal tools (scissors, pliers, tweezers, files ) out of the way and easy to access.
Sanders/files: Ultimate or Flory sanding sticks (or Squadron, which are ok) are a must. I keep them all in a big coffee jug front and centre on the desk. But you also must get a full set of Micro Mesh sanders too - very important for paint preparation and smooth out dusty/matt paint jobs and polishing. The Flexifile flexibile sanders are expensive, but do a good job - I found the U-star "U" handle sanders to be just as good for less than half price. Also get a good quality set of fine "rifle" files of different profiles.
Micro Sol/Set: get the full set - will do all your decal prep/softening plus Micro Mask is good for small masking jobs, the KRistal Klear for glueing canopies/clear plastic parts. Thin this a bit with water.
Artists turpentine: dont get the Mig/AMMo etc turps/thinners, go to an artists store and get their odorless turps at much lower price to do your enamel based washes and cleanups
Paintbrushes: get two kinds. Cheap and nasty to do "work" like jobs, eg applying mud, plaster, heavy weathering and even drybrushing (cut the brush down), and a very very good set of flats, sabers and fines - do not skimp here as expensive paintbrushes are worth it. If you can, buy two sets, one for acrylic paints and one for oil paints. Also get a tub of brush repairer - I use "The Masters".
Knives: I have two hobby knives, one straight blade, one curved, on my desk with their blades stuck into a "tub" of packing polystrene, makes it handy and safe for access. I change the blade on the straight whenever i start a new model.
Sprue cutters: get good quality, sturdy ones from Xuron or Tamiya.
Cant think of anything else, probably a lot more, I wish someone had written this list above when i was first starting out so hope this helps!