After seeing some gargraves track, I'm having second thoughts of using that cost cutting method. So, when it comes to LGB and Aristocraft track, can I mix the two? Or should I pick a brand and stick to it? Also, what should I expect to pay for used track on EBay? I'm seeing numbers of around $3/foot which is about half price, but the shipping charges are usually large. Should I expect to pay less for one brand over the other. If the cost of used track is to high, I'll probably go the gargraves route.