Hello RichyX
welcome to the boards, you'll find lots of usefull info in here
well, you're question is sorta vague, what kind of model are you looking for? what is your budget?
if you want scale models, the best ones are mostly from Hasegawa
if you want toys, currently, the best is Yamato, but they are sorta expensive and right know you have reached a sorta big debate on the forum about their toys, in general, they are very good in detail, but it sometimes leaves a bit more desired for their price
the Robotech masterpiece valks you mention are for some reason expensive and consider a collector item but they are really nowhere near as good as Yamato's, but if you want to make a profit, keep them sealed up cause their market value keeps increasing over the years
it's nice that you're getting into a lot of Macross, but errrr.... try not to mention 'robotech' too much here since people aren't very fond of it (long story) and also, don't dwell too much on Macross 7, hhahaha! theirs a newbie thread that might be usefull (if you want to read 80 plus pages)
also for peoples collection, you might want to check the 'display your collection' thread
Display collection
hope this help, good luck, nice to have a new member, welcome aboard!