good advice from Jure already.
You should start with a superb v1 base watch. Movement mods are not high priority and too many guys starting out focus on this too much. Its nice to have the engraved rotor with ETA bearing but if you can't get one there's always Francisco to consider.
Definitely swap the crystal to something thicker. Taka datewheel is also a good upgrade depending which watch you buy. (i think if you have the $700 allblack then its not worth the upgrade).
Good watch to start:
v1 Tuiga: swap crystal and DW, maybe relume. No mvt mods required as its closed back.
Icebang: Crystal, DW, stealth lume.
Allblack: Crystal, Marker mod. *DW if wrong colour
Black magic: Crystal, DW, relume?
additional upgrades like Ti screws and Ti casebacks make it more personal.
Here's some of mine... {the one in the center is the v1-lite, *watch to right has rep crystal}