Hemi??? hmmm
1. Good all rounder, planets, moon, deep space object.
planetry and deep space can be specailst scopes for example a F4 for deep space or a F15 for planets . something like an F6 is a good all round start. (8" or bigger at your budget)
2. Longevity, ie room to grow into over many years
probably go 10" or 12" depending on stuff. stuff being height issues and weight issues. there is probably other stuff but ive been painting all day so the brain is no at its sharpest right now.
3. Some potential for basic astrophotography in the future
this means a expensieve GEM and a scope designed to suit, with the budget you have you may stretch to a gem mounted 8' like
https://www.bintelshop.com.au/welcome.htm PLUS a camera etc you can spent a lot here, a real lot... id leave it till later.
4. Manageable for 1 person, although most likely will be fixed in back yard mostly
12" may be doable but best you head off to a local club and see if someone has one you can get the feel of... bigger is better (applies to engines, boats and telescopes ONLY). really buy some good shares, get an 8" dob and see how you go, when you have been doing it a while sell some shares and get something biger or a GEM for the 8" and a camera..... etc
Roger