Sounds like a good time, just keep playing and you'll get the hang of it.
150g is OK for drivers, however - for mids and putters I would say aim for 165g +
DX plastic is fine for mids/putters , but certain drivers don't have very good durability in DX(I wouldn't use DX on anything faster than a fairway driver, personally - unless it was just for open field shots). Its not that "fast"(high speed/big winged) drivers don't "fly well" in base-line plastic. Its more that they don't hold up very well to abuse for whatever reason(could be the thin wings).
Fairway drivers tend to hold up a bit better in DX, especially the stable ones.
In regards to your putting, its somewhat common for beginners to be more proficient at putting with a mid range versus a putter. The reason why is the depth of the rim. Putters take some getting used to because they feel so different than anything else in the bag, and they perform the most frustrating task
. Do yourself a favor and stick with the Magnet, in the long run you're much better off. Nobody is winning world championships putting with a buzz, and you probably wont be the first
Once you get used to the feel of putter molds, they become much more accurate than mid ranges for putting.
These are just my suggestions, to each their own.
I take it you throw RHBH?(Right-hand, back-hand?) Or are you one of those hippie scum-bag flickers