Mabuhay and Welcome to the forum Josh! As everyone has mentioned, Highbrow never got to our shores. Omega Supreme (encore) sold for US$140 when it first got released, best to scour the online stores and ebay to get a rough estimate on how much he is worth now as prices still vary depending on the state of the figure - whether MISB, loose, etc. Omega is indeed a very awesome LEGO former
Dont worry about the gobots, a lot of us here have them in our collections as well, I even have the doggie base for the guardians
Hope you get the time to post up pics of your collection in the Grapple's section - just start your own collection thread. Also, it doesn't matter as well whether it's a small or big collection, WE LOVE looking at other people's collections here. Big or small as long as it's loved is equally precious.
so again...

to OTCA and enjoy the forum!
Wanted AM partner Vanguard, Myclones Dirge, G1 Victory Leo, e-hobby Dark scream ( the black version), e-hobby Magnificus
Parts- AM partner Basher-side guns, G1 Actionmaster Elite Windmill's blades[I][B]