I recently picked up a Mojotone clone of the G12H30, the BV-30H, and I was impressed. It sounded better than my 70th ann G12H in an A/B comparison. It was smoother, more articulate, and overall better sounding.
And at half the price of the Celestion, and being Made in USA, not China, it is a steal.
We have some great Celestion clone options right now with Mojotone, Warehouse Guitar Speakers (I had Greenback clones I regret selling) and Eminence's Red Coat line, lotsa options that won't break the bank. I can include Weber in that mix too, though I haven't actually heard one in person