Angiography surgery -should I travel to a city for this?

Yes. Yes if you need to get angiogram (? With possible stent placement of that blood vessel) if that service is not available in your local area.
High volume center. I would have the procedure performed at a high center. The number of procedures an operator has performed is directly related to outcome.
Depends Many Options. Angiograms: for symptoms/complications of advanced arterial disease. Surgery, endovascular or open, an option for extremely advanced complex ds. However, artery disease typically starts in childhood, is within the walls of the arteries & does not affect opening for decades. Plaque ruptures & clots narrow/close the openings. Best focus: optimize NMR particle test, hba1c, bp, no smoking, exercise...