Well it does do large coverage, but it's external mix so the finish pretty much won't be as good as some airbrush that's just a little higher in cost. $45 is still quite a lot for that thing though. http://www.dixieart.com/Dixie_Art_Supplies_Airbrush_Main_Page.html
On Badger side I'd suggest 200 with the medium tip for a single action airbrush or the 155 for a double action, which might help you later on if you try for other catergory of kits. Those two share the same spray qualities. I personally say a single aciton airbrush is plenty for automotive kits and is easier to control/lower on price. You will need to get a bager to iwata hose adapter if you want to use the hose that was for the Tamiya SF.
On Iwata side, there is the HP-BCS for about 25 dollars relatively more as a double action ab. They don't really got single action abs... I haven't tried any other makes (well aside from Tamiya and Aztek), so I can't comment on them. There is always that on-going debate regarding which one to choose among them, owning both the 155 and HP-BCS, I'd say they both do a pretty good job at large area coverage and the HP-BCS can do some slightly finer jobs than the 155 though I feel the 155 can take just a little more abuse, but I am just gonna leave it at that.
Note that dixieart also ships for free for orders above like 45 bucks and they carry replacement needles and tips that you can get with the order together in prep for possible screw ups later.