Rollers, trainers, and balance (beginner question)

[Catrin]

While I am unsure that I want/need the additional expense right now, I am wondering how useful a roller or trainer might be for me to help prepare for spring. I go to 3 spinning classes a week and two sessions with my personal trainer - but that isn't giving me any time to get to know my bike .

Which would be better for a beginner, rollers or a trainer? I know that you have to balance on rollers - which would seem to be a good idea for me - and my LBS has this on sale http://bgindy.com/product/09-cycleop...rs-41032-1.htm.

I don't see how the resistance could be varied on rollers though, so would there be much of a chance to practice shifting? I know that is possible with a trainer, such as this one that is also on sale: http://bgindy.com/product/09-cycleop...er-41027-1.htm, and I understand that a climbing block is also needed for this trainer which is an additional $25.

Right now I am trying to decide if cold-weather practice, or a trainer (or both), would be better to help me hit the road running in spring. In the end, I will need to make a choice, but more information will certainly help me make an informed one. I am really trying not to spend any more than I need to - and sometimes it is just too easy to spend money