Yet another "what do I do next" thread.

The cool thing is, you can take your weapons for your Ag mediums to 8 or 9, which would be high silver, and they will instantly transfer to a heavy hangar later. Alternatively, you can level off at 7 with weapons you'll use higher up and then move to a basic Ag heavy hangar (griffin/leo/fury), which puts you in mid/high silver also. This is good practice to eventually ease into low gold.

And I would recommend trying to level everything evenly if you can, like getting all bots to level 4 as you'll be more effective in the short term.

Try to resist buying the wsp bots you mentioned for now, they will bump you up a tier at least. Try to buy tarans and magnums until you have 3 or 4 of each. You'll be glad you did. And you can use all of them through silver as they're leveling up.

Thanks for the advice!
I'm following Zhou's recommended high silver heavy hangar and currently have:
Lvl 6 Griffin 6/5/1/1 Taran/Taran/Mag/Mag
Lvl 6 Griffin 5/5/6/7 Tul/Tul/Pin/Pin
Lvl 6 Leo 5/9/9/9 Thunder/Mag/Mag/Mag
Lvl 6 Leo 6/5/6/7 Thunder/Pinata/Pinata/Pinata
Lvl 4 Boa 5/5 Thunder/Orkan

So next I push the weapon levels on the griffins and the thunder pinata Leo all to 8 and don't touch my thunder Mag Leo for now. Then how far would I be able to upgrade the Boa and its weapons to be on par with my heavies?

Don't use it first until weapons are good enough for high silver. 

As for Boa, yes, you can go up to 7/9. Need more Taran and probably you can make another Taran/Mag Griffin, and move them to Rhino since weapon loadouts are the same. 

And from the Boa, you can upgrade them to the Lancelot in the future just by adding another medium weapon. But other than that, just enjoy whatever you are using now.