You might want to look ahead into what kind of kit you want to build, as in scale, manufacturer, etc.
I'm not very familiar with any scale other than 1/35, in terms of armor, so I don't quite know what to suggest. However, in the 1/35 scale, there are pleanty of kits around. The more expensive mainstream ones are the Tamiya and Italeri kits. Trumpeter makes 3 or 4 different kits of the M1Ax, and they're fairly cheap. HobbyCraft also has one, albeit a reboxed Trumpeter kit :)
I don't know about Dragon. Personally, I'm not a fan. I have so far only built one Dragon kit, of the MAZ-543 TEL, and the quality of that kit was less than average. It took me weeks of cleanup and prep work, so much so that at the end, I got so tired I didn't even bother to add any details such as cables, etc.
Maybe someone else out there has suggestions...