I have only DTV since it does carry my local channels. I have two DirectTiVos and just bought a Pioneer DVR-633H because I want to archive some of the sat-stuff, plus archiving some camcorder stuff. It seems to me that the Pioneer would be a better choice than a stand-alone TiVo - sorry, no advice about Replay.
But assuming you don't have a compelling need for HiDef recording, here's why I think Pioneer might be a good choice for you:
1. It's basically cheap! If you don't need firewire, get the DVR-531H from Walmart at $298.
2. it will serve as PVR for your OTA channels
3. Although its built-in TV Guide has many problems, you can still use it for timer recordings, just like a VCR.
4. It provides archiving to DVD of everything you're watching, DTV or TiVo or OTA
5. If you ever need to archive camcorder stuff, that's available too.
6. It's control features are very sophisticated, 4 speeds forward & reverse, plus SlowMotion in 4 different speeds.
Regarding this last item, transport control, I thought TiVo's 30-skip was great until I hooked up the Pioneer a few weeks ago. It has hyperscan x1.33 with voice, meaning you can record news programs or sports, then watch AND listen in hyperspeed. I've taken to making copies of TiVo recording to the Pio's hard drive so I can use this feature. And instead of clicking x6 to get thru a 3-min commercial, it can jump forward by half, 1, 2, 3, 5 or 10 mins.
Other DVRs are available out there - Pana, Toshiba, others - But the impression I got by reading here, the Pioneer has equal or better video quality. Considering the $300 price, including an 80gig drive PLUS dual-layer DVD recording .... I just don't see anything comparable.
~ (sv_chamelea is my sailboat).