Well that's clear then.....
Ok since you dont seem to be clear regarding why you want those lenses, It may be best you do not get either till you are sure why you want it. Those 2 lenses that you have cover a handy range. Maybe spend the money on courses. They are fun and you should learn a lot from it esp. if the course specialises on a subject you are interested in taking. Maybe join a local camera club and take part in their friendly competitions. I find it was a great learning experience to hear the judges comments on my pictures.
You need to have a reason and purpose to get a lens otherwise its going to be a paper weight. Also if you dont give us a reason we will be unable to give you a suggestion that makes sense. eg If I had those 2 lenses I would sell them both and get a macro but thats me I love macros. You have to tell us your motivation else its all meaningless what ever we suggest.