I don't want to sound mean, but you're already spending $300/month to support channel. I say let it coast for a while on the HD 4M/E. That thing only arrived back in late October? (can't remember now)
Ya realistically I'm not gonna switch over to 4K any time soon, not only would I have to upgrade this, but it'd be a bunch of new cables and converters and monitors and who knows what else!