Insulation, Radiant and Vapor Barriers - adding attic insulation over existing layer

I've got what appears to be old wool batts that are wrapped top and bottom in black paper between the joists (under 1 x 8 x 15' flooring planks), and I'd like to add more insulation on top of it. Two questions:
1. What's the best way to go, product wise
2. If the answer to 1. is unfaced fiberglass batt, do I lose a lot by not going crosswise with the 2nd layer?

I hear a lot of talk about using the blown-in cellulose - would that be a good option if I need to keep the floor boards up there?

Thanks for your advice!

Yes you lose alot if you dont put in new batts crosswise cause you will lose coverage. I had this same problem with my attic. I just added a foot or so of cellulose over everything. If you can reach under the floorboards and fit a hose under there its easy. Otherwise pull up some of them (like i did) or all and then add in the cellulose. You could also just drill 2 inch holes in the boards if you cannot pull them up and then blow the cellulose in there. I would suggest the cellulose cause its so good at filling up all emtpy spaces that you might miss with the batts. Make sure however you check for any potential routes of air leaks and use foam sealant on them before you blow in.

thanks a bunch, dOObs - sounds like a good plan!