You won't regret it. The .50 Caliber is a great amp. By the way, is it a + (6L6) or normal .50 Cal? Both good but I'd choose different speakers depending on which model it is.
If it's a + I'd go for an EVM12L. Tight and powerful.
If it's not a plus, I reckon the Mesa C-90 is a better match for the EL84s.
If weight is a major concern, you might consider the Celestion Neo series. Neo 100 for a + or Neo Vintage for a non+. These speakers are a lot lighter than conventional ceramic magnet speakers.
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