Heck, if you are getting a red dot you can wait for the irons until funds allow! You really don't need to have them both at the same time.
Just take it a little bit at a time, you will never be completely done with your AR, there will always be something to add. Trying to get it all at once will just drive you crazy
Which TRS models are you finding and I will try to help you narrow down between the different features.