I'm assuming your watching/recording patterns would require more than 3 tuners full-time.
For me, replacing 3 HR24s with a Hopper and one Joey would be just fine and that's because the only time I need those 6 is during prime time and that because of broadcast channels. At every other time of day, no more than 3 tuners are ever needed by me and my son. We both watch almost zero live channels, everything is recorded and watched when it is convenient for us.
That said, an HR34 with a single Hxx would do fine also.
If the money was right, I would switch to either right now. But since I'm relatively a new customer to D*, they didn't offer any deal whatsoever for the HR34. And with the ETF as it is right now, switching to Dish would cost me something less than $100 overall to switch.
But come August, when my rebates expire, it is a whole new ballgame. I can switch to Dish at that time, and even with a $240 ETF, I would save another $240 over the first year. I'm very much leaning towards doing just that as the channels I watch in HD are almost all offered with both services.