Erik,
Honestly, you're thinking about this way too much. That's okay, it's what student pilots do. You'll also soon be stuffing your flight bag with every chart, gadget, holder, kneeboard, manual, and cloud level finder known to Man, God, and Sporty's. It's a natural evoloution of learning to fly.
However, don't get too wrapped up in how your logbook goes. Two thousand hours from now and five years down the line, the interviewer isn't going to say, "wow, as a student pilot he kept such nice logs. And my, look at the ink!" Don't worry about it. Do avoid whiteout, and use black pen instead of pencil, but otherwise, do as you like.
I have a logbook crammed with pictures of airplanes; little snapshots taken here or there. I am not a picture taking person normally, and these represent the sum total of my souvineers from a seventeen year stretch in one book...but the point is that it's your logbook. Keep it interesting, professional, and neat, but don't get too wrapped up in the details of ink, pens, or even necessarily the type of logbook.
14 CFR 61.51 spells out what you must log, and gives you the guidelines. After that, it's your book, and you keep it as it pleases you.
Incidentally, I've had more of those uniball pens blow up on me (literally) at altitude and get ink everywhere, than any other kind. Usually no fanfare; the pens working just fine one moment, and then my hand is covered in black ink the next. I don't carry them any more. I'm not a pen snob, but I've taken a liking to the G2 gel pens (dunno who makes them). Until a few days ago, anyway, when I got red ink all over the white sleeve of a uniform shirt. I spent the day having everyone asking me where I was bleeding.
Truthfully, check most any pilots shirt pocket, and you won't find expensive, nice flowing pens. You'll find something half chewed with a motel logo on it. I have a whole pile of hotel pens right here by my computer as the sad evidence of far too much time spent on the road.
Sometimes the most authentic signature in the logbook is the unspoken proof of a dozen different types of ink, of changes in handwriting due to being in a rush, being tired, being whatever. It shoes variety, it shows elapsed time, and it shows an interviewer that it's real and not a cobbled forgery. Be yourself, use whatever is handy to write, and remember, it's a logbook, not a bible. (Bibles don't have enough columns, and it's hard to get everything in between the margins). Done properly, however, your logbooks may one day be cherished keepsakes for your kids. Keep it real, and have some fun. Your log is more than a preparation for an interview; it's a bank for memories.
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