I've got a looooooot og Gunpla to build.
If it's limited to Zeta, Fine, I've got several of them and some projects including a FA (Full Armor), for example.
But one suggestion : to do a quick job, with a good result, small budget and a lot of place to do something cool, like a diorama, why not do that with some FG (first grade) 1/144 models ?
FG have no good reputation but have a lot of potential, the modern FG that is... And with the cannon foder that are the common MS like Zaku in MS Gundam, Ginn in Seed Gundam and so on, the possibilites are but vast.
The MG are good, even the RG are the best Gunpla EVER, but articulating an MS is a lot of work and time wasted that you can't take to make details, diorama, with a cool pose. Ten years ago with Seed Gundam Dengeki Hobby Magazine was full of that kind of work, incredible job with simple FG model kits.