well, for a 2 gun economy package, it's hard to beat the starting line setup... Binks, Sata, Devilbiss, Sharpe, Iwata, all have higher end guns, but your usually talking $200+... especially Sata's, they can get pricey..
Sharpe makes a nice economy gun in the Finex, but even that runs about $100 for one gun... thats usually why i recommend the starting line setup, 2 guns, and they end up being $60 or so a piece and your covered for the majority of spraying...
you could go for the HF kit....
http://www.harborfreight.com/air-tools/paint/professional-automotive-hvlp-spray-gun-kit-94572.html
but you better be VERY careful, and thorough in your cleaning... and they are not rebuildable.. I've seen them with plastic adjustment knobs and such, spray ok, go to clean em and parts start melting...
i also see tcp has a 3 gun kit, but again, i can't vouch for quality and it may be the same deal as the HF...
http://cgi.ebay.com/ebaymotors/3-TC...Z200626193031QQptZMotorsQ5fAutomotiveQ5fTools
do yourself a favor and just buy a 5 gal pail of the cheapest lacquer thinner your autobody place carries.. usually it's about 35, $40... it should last you thru the project and is much cheaper than gallons, which you end up going thru pretty quick... VERY handy to have thinner around for things other than cleaning guns, cleaning spreaders, weatherstripping, etc..
actually, it would have helped you yesterday in the humidity. many times you can wipe over dried fillers with a rag of thinner, than it sands ok for ya...