I would hesitate in recommending Boettner's Roman Catholicism as it is a bit dated. The RC church has moved on and although the traditional teaching of the church is still intact the RC you meet has changed. 'Faith for Today' is very good as it is an official RC publication but it gives a good picture of RC belief and practice today. Other books published by the CTS are worthwhile as they tell you what RC teaching is which is sometimes quite different to what Protestants writers tell you what RCs teaching is. Comparing CTS publications with scripture tells you all you need to know.
In terms of apologetics, Herbie Carson's 'Dawn or Twilight' is good.