It’s not about the price. I have flown 2+B machs with no issue.
Two things make you a target : you are not moving and you are in a mission hub. Plus of course, you stay in a corp with wardecs on.
Then, the most important factor is the price. What is a correct price for you ?
To me a ship that cost less than 1B is “cheap”. The efficiency improvement from pimped modules is IMO totally worth the increase in price, because a “bit more” tank from a pimped tank module means more apply/DPS rigs and mods ; and better propmod usually means bettter cap . So don’t be afraid to pimp your ship, as long as you are not a sitting duck in a mission hub it should be fine.
So now, about the ship.
Depending on your agents, ships are more or less efficient. eg mach is not that good vs sansha/blood, while NM is.
If you just need to get back to basics, a temporary raven with MJD+AB should be enough to snipe any mission - though not very huge DPS.
raven 500M
[Raven, *Simulated Raven]
Ballistic Control System II
Ballistic Control System II
Ballistic Control System II
Signal Amplifier II
Damage Control II
Republic Fleet Large Cap Battery
Large Micro Jump Drive
100MN Afterburner II
Republic Fleet Target Painter
Pith C-Type X-Large Shield Booster
Adaptive Invulnerability Field II
Caldari Navy Kinetic Deflection Field
Cruise Missile Launcher II
Cruise Missile Launcher II
Cruise Missile Launcher II
Cruise Missile Launcher II
Cruise Missile Launcher II
Cruise Missile Launcher II
Large Warhead Flare Catalyst II
Large Warhead Rigor Catalyst II
Large Core Defense Capacitor Safeguard II
Hornet II x5
Inferno Fury Cruise Missile x162
The pith gives the ability to survive big damage in case you just jumped in with your mjd on cooldown. You can swap it for a gist c-type large, and replace cap rig with a CCC II to be cap stable but at the price of lower shield boosting(more than twice less) - but then you have more fitting room to get a pith hardener.
You need to switch the hardener according to mission (here it is vs mordu/guristas/angel).
Other than that, you warp in, you mjd, then you paint and spread the pain.
If you add a auto-targeting in high (don’t activate it), you have 11 targets (instead of base 7) . you can target at 140 km, at which range your painter will do less effect BUT you can use it to aggro frigates, which then will rush towards you with mwd , while you switch to precision cruise to have better apply
DPS is 870 with cruise @140 km, 620 with precision @116 km
alpha is 6k with cruise, 4k with precision.