Yes stick with the Vantage, will be great, there is a post with a cheap hack
(here) to convert to 2.4 but the receivers may not be as robust as you may be used to (flight stuff) but works for a lot of racers, I don't think you will find as many on the rostrum with clashing crystals.
Combi's may be a bit cheaper than 2 box's and you know if there are problems it's not because, but I am sure there are name brands you know and good value brands you don't. Whatever you decide there is money to be spent, if you feel you are in for a while then good kit is worth having.