Thank you both for your suggestions. With all due respect and appreciation, I think I will adopt the Scotch 4 knights as I already play the classical Lopez which is one of Markovich's recommendations (thanks for that).  Then against d4 I play the grunfeld or tarrasch (anothe Markovich recommendation, I believe) depending on white.  Thanks again for your suggestions and book recommendations.

So you want a simple opening that allows you to attack huh? Well nothing really wrong per se with your choices so far. They are respectable openings, but the trouble with things like the 4 kts is that they lead to almost symmetrical positions. In such positions it is very hard to really play for dashing attacks (if that is what you are looking for) as balanced positions have very little tension or imbalances. So the tendency is to lead to long drawn out positional moves and try to squeeze something out of it in an ending. Either that or it leads to fairly drawish positions. But i suppose with some imagination you might be able to create some imbalances around too in the 4 kts, tho i still doubt that you would attain the same kind of piece activity or attacking scope as say in the evans or KG..

In my opinion anyway (of course the others would have their own recommendations), i would play things like the Evans or KG. You would notice that piece developmnt is very rapid and plenty of scope to play for an attack. The best part is they also have quite a fair bit of strategic scope. So you can practice both your tactical and poitional stuff whilst playing these. These are also easy to learn as far as getting the main ideas and themes are concerned, and being not so often played, you can be rest assured that development of theory is not so rapid like say the Lopez or Sicilian etc. The main line for the openings which ive recommended also does not go all the way to move 20 or some middle of a middlegame position as other popular openings.

Just my 2c.