Iriseyes asked about my favorite cardstock, so I thought I'd post about it.
The first rule of paper craft supplies is to buy quality product. If you use cheap cardstock, your cards will look cheap. Cheap stamps don't work as well as high-quality stamps. Cheap inks don't stamp as well. Cheap rhinestones won't stick. And so on.
Most of my cards have white or cream bases, so I need a sturdy cardstock. My favorite white/cream/kraft cardstock comes from Papertrey Ink. It's very heavy and has a bit of tooth (not totally smooth like SU's whisper white) that helps inks dry quickly and takes ink beautifully. SU's Read Red classic ink NEVER dries on whisper white, but it's good to go in seconds on PTI's paper.
BTW, Real Red is my all-time favorite red. I've tried about 10 different red inks, and none comes close to the richness of SU's Real Red.
PTI's cardstock, because of its thickness, requires scoring to get good, smooth folds. My Scor-Pal comes in handy for this, but I used to use a ruler and butter knife with good results, too. The thickness also makes it perfect for one-panel notecards that look every bit as nice as Crane's stationery.
For colored cardstock, I use SU and PTI, both of which are equally high quality, IMHO. PTI's might be slightly heavier. I love the coordinated product lines of SU and PTI because they make life so much easier and both are high quality.
I'm certain there are other brands of cardstock every bit as good as PTI's and SU, so please don't take my word as the last word on cardstock. I try to limit my own purchasing to a few companies to keep life simple, but this means I'm slow to pick up on new trends and product that other companies might offer.
Also, the second rule of paper craft supplies is to use the right product for the right purpose. For instance, I've read rave reviews of Gina K's heavy cardstock for use with Copics, but as I don't HAVE Copics (except for the three Susie Berker sent me as blog candy), I haven't tried it. Different types of cardstock yield different results with different techniques. Experiment to find what works best for your needs.
I hope this answers your question, iriseyes, and I invite you all to share your favorite cardstocks in the comments.