I know a little about Rosin, and have been pressing for a couple years now. Best bang for the buck is to build your own press. I went with a Dake B-10 and 3"x7" caged plates from DabPress. With that setup, you can squish anywhere from a single gram to a half ounce (in a filter bag for the larger amounts) I started doing 1/8ths without using a bag, just pre-pressing the puck in the middle of a Scotch Tape roll, then pressing in parchment.
You'll want your bud at around 60% humidity, do not grind it, but break up the larger buds and take out stems. Press around 200 F for 2-3 minutes.
I love it, and call it cannabis caviar for my non-rosin acquainted friends. If you are anywhere near Denver, I'd be happy to let you come over and check it out and ask more questions in person.
-Stubbie