Where I work, we've been capturing & converting digital video for years [analog, too, though not so often anymore], and until the VHS tapes stopped coming to us, I used a Sony DVMC-DA2 Media Converter. Excellent little box. Connects to either analog or digital video sources, and converts to digital, sending the result to your computer via FireWire.
S-video & RCA in/outs, and a FireWire in/out. It's quite old, so you might find a good deal on one, or you may find something similar on the market today. This one works fine so I have never needed to look for another.
But its main benefit to me is flexibility: I have to be prepared for a number of incoming video formats. You have only one, I assume.
If you're only using miniDV tapes exclusively, for example, you can get a Sony DSR-10 [or a more advanced deck with more features]. I use a DSR-20 [and have done, for several years], and I have that hooked up now instead of the old media converter, because I rarely get a VHS tape now. My coworkers use a DSR-40 and are quite happy with them.
Good tape decks reward good treatment: try not to use different kinds of tape cassette [because the magnetic stuff on each of them is different, and just using a different kind of tape can cause the deck's tape heads to magnetize more easily... or something like that. I was told it's best to avoid that.]. We must work with whatever tapes clients give us, so we also have the tape heads cleaned now & then, but I am lucky enough not to deal with that, and I don't know how often.