Another thing to consider is if you want the heavier weighted keys (piano keys) or the lighter synth action keys (typically much cheaper). From initial post it seems to be about the latter, synth keys, and no need for a big heavy piano keyboard.
E.g. the proposed Roland A-88 would be weighted piano keys, while the proposed Roland A-49 would be synth action keys. I have an A-49 myself; it’s cheap and has nice keys (velocity sensitive, almost all are) for this low price class, and it does the job. It also has sustain, expression and midi out connections, and it has a small depth size which saves some space. It’s easy to setup (just plug it in). It has a couple of buttons and knobs, but there are others that have plenty more of that for more control options, like the one Romano suggested above. It’s up to you what you need. (More advanced keyboards can also have keys with after-touch, but if you want something simple for note input, it’s probably not something you need.)
But if you do orchestral stuff you would like to have a proper modulation wheel to control dynamics; the Rolands above have the typical Roland combined pitch/mod-stick that springs back directly. A separate modulation wheel that stays in place, and also has a wider motion range, is much better for this.
And how many octaves or keys do you need, do you intend to do two-handed input playing, or will it be mostly one-handed playing? For two-hands you would likely don’t want below 61 keys, for one-hand it could be whatever size that fits your space and preference (there is normally octave shifting buttons, however a bit annoying if you need to shift often, so if you have space then 49 is a good choice).
Your intended price range will also affect your choice options, of course.