I love the idea of the reti (especially the modern reti by delchev) but what if Black plays 1. ... Nf6 or 1. ... Nc6 in response to 1. Nf3 ?
I like the Blackmar-deimer gambit accepted but not many players at my level ever play 1. ... d5 in response to 1. d4. The variations where the gambit is declined don't appeal to me greatly, but I would consider playing it a few times in recreational games to give it a fair chance.
The veresov I don't particularly like, but knowing that such a line has proved to be effective in the past could be useful knowledge.
So I doubt I will be playing the reti or the blackmar-deimer anytime soon though I like white's position in each of them.
As for playing as black against 1. d4, I play the old benoni.
Might i suggest the Benko gambit?U get the initiative and it is fun to play,you just need to know the ideas very well or you will get into trouble.