dannydebont wrote:I also managed to get a UBEC from a local hobby store ... I got one that has a 3A rating ... hope it won't bake the Pi ...
As long as the UBEC has the correct voltage (5 +/- 0.25V), and can supply the current your equipment needs, there should be no problem.
Low voltage may cause problems, depending on what is connected and what it needs.
High voltage risks causing serious damage.
Low current capability will lead to low voltage.
High current capability is fine -- the equipment will only draw what it needs. 3A should be enough, since 2.5A minimum is usually recommended.
Think of electricity in a wire like water in a pipe:
If the pressure (voltage) is low, you may not get enough.
If the pressure (voltage) is high, things will break.
If the flow is limited, for example by a thin supply pipe (cheap USB cable), you may have problems.
A good fat supply pipe (good thick USB cable) is fine, as long as the pressure (voltage) is right only the amount of water you want will flow.