I've also heard excellent things about Outlier Linguistics' resources for Chinese characters, assuming you're still spending a lot of effort learning characters.
I'll try 國語日報, I'm not sure where to buy it though (it used to be available easily in every 7-Eleven out there but it's been a while since I've seen a copy in a convenience store...).
I already know between 800 and 1000 traditional characters. Looking at Outlier Linguistics products, it seems more targeted towards the entry level. Their Pleco dictionary is nice, though. Reminds me of the explanations one could find in Wenlai (a desktop Chinese-English dictionary with a lot of historical explanations for each characters).