This really depends on what you want to do with the rifle. If you want to keep it CMP Vintage Sniper legal then you are limited to a certain number of options for optics. If you just want to shoot it then sky is the limit.
Mine came from Creedmoor Sports. Same gun as yours. Made by Rock Ridge Machine Works in PA. Had the M73G2 on it and it had some issues. Sent it to RRMW and they swapped it for a M73G4. I ended up selling the G4, chicom rings and base and installing a Lyman Alaskan and authentic Redfield period correct hardware.
The stocks need work right out of the box and the 03A3 stamped trigger guards suck on these soft Italian (Minelli) stocks. They continue to compress resulting in loss of clamping load and allow the action to shift.
My A4orgery doesn't much resemble what I originally purchased. I've replaced the stock, new bolt sleeve with forged handle, 1903 trigger guard, aforementioned optics and a few other odds and ends. Shoots well now.