On the subject of designer jeans - some general guidelines are: PDC - fit perfectly and comfortably, and they are stitched to eliminate certain unsightly qualities that other jeans may put on your body, and give you a truly stunning sillhouette (not to mention being extremely comfortable). Hand-done fading lines in the most perfect areas, and absolutely impeccable (sp?) color-fading. PDC jeans tend to run a little large on the waist. Sevens - Super trendy and of course you won't go wrong wearing these around (you'll probably get more brand-oriented compliments than PDC, as they are much less subtle in their design), but in general they do not fit as nicely as PDC does. Diesel - Extremely trendy, very comfortable, but the general absurdness of their washes will go out of style quickly I think. They are generally tighter and lower rise (some down to 7.5" rises). Dolce & Gabbana - I don't know what to say about these, they look nice and are generally much slimmer than other jeans (I.e. I can fit a 28w with PDC, but 30w with D&G is about right too). They are nice jeans but I wouldn't recommend them, as the only ones in the same price range with the afformentioned designers (PDC, Diesel, Seven) are not very special or nice-looking. The higher end Dolce jeans are just way too expensive to buy unless you can casually spend upwards of $400 for jeans. Levi's Premium - They are very nice, but for the same price you can get lower-end Sevens, and for $30 more you can get PDC. I don't know anything about J. Lindeburg but from how they were described earlier I definitely would like to investigate them. I hope this helps.
Edit: PDC jeans usually only come in 34" inseam, you can get them tailored to your height, but I wouldn't try to if I was under 6', because you would lose the fit of the jean by moving the inseam too far up the boot leg.