no need to bump a post, it will automatically come to the top when answered.
You're also not likely to get many answers within a few hours of posting ... best to give it a full day (or even two), so that more people can see it and respond.
You might also get more answers, and maybe even quicker ones, if you post your question on the Electronics forum. And, your questions may have already been answered there, too. There are a lot of discussions on mapping software, sd cards, the units that use them, how they compare, etc. If you don't get any replies here, check out the posts in the Electronics section.
... luck2ya .. cp