I have four.
1. My mother's A5 size black leather softcover KJV from 1962.
2. An A5 size pink-and-cream leather softcover NIV "gift bible" I bought in 2005 when this whole "Jesus thing" started bothering me.
3. A teeny-tiny red Gideons NIV NT-and-Psalms (or maybe that doesn't count cz it's not complete...?).
4. A pocket-sized black leather NJKV that I asked for for Xmas last year.
And how many Bibles do you think one should have? How few is too few, how many is too many? And why?
Zero is too few.
I think the maximum depends on why you're collecting them.
If you're obsessed with study to the exclusion of all else, it might be better to chillax yourself and stick to one for a while. You're not going to go to hell for reading the Good News translation for a year or two while you train your eyes back onto God.
If you're into studying and enjoy languages etc., I'd advise getting one thought-for-thought and one word-for-word translation, or at least one Bible on each side of the scale. The comparison is really illuminating sometimes.
Hence me getting a NKJV to use next to my NIV, which started feeling a little too extrapolated to me. I could have used the KJV for that, but although I love the translation, it's a little too esoteric sometimes with the old, old word usages.
I think it's also good to get a study bible if you're into that. I'm hoping to purchase the Orthodox Study Bible soon. I think then my collection will be pretty complete. Although I'd also like a Douay-Rheims... o dear... maybe I need to follow my own advice with the obsession bit
Do you prefer to buy cheaper hardback, or purchase nicer bonded or genuine leather? Why?
Honestly, I don't care about the covers at all, although I prefer one that's quite durable, so I tend to get leather or faux-leather covers rather than paper or hardboard.
To me, the size/bulkiness factor is more important. I love my teeny Gideons NIV NT+Psalms and my pocket-sized NKJV. I made a brocade bag for them, and carry both everywhere in my purse with me. That way I can whip out my NIV for a quick Psalm reading wherever I am, but I can also bring out the big NKJV guns for an impromptu debate
So yeah, I would rather have a teeny, portable Bible than an unwieldy, massive one. Same goes for prayerbooks.