Contrary to some of the recommendations above, I suggest that you begin by spending time at a club that focuses on ISSF and NRA, try out some of the pistols that the competitors are using, shoot a match or three with borrowed guns and then purchase what works for you. Smith M41s were top line pistols back in the 50s thru 70s, as were the various HiStandards. I have run the gun check at the National matches for several years and the usual things I see are Walther GSPs, Pardini SPs, the odd Hammerli 208, and 280, or SP20. Only one M41 came thru last year, no HiStandards, no Rugers. Match Gun MG2 s are starting to appear more regularly.
i would suggest that you back off from a 45 for a year or two. Look at the matches that you will shoot. ISSF has air pistol, 50 metre (free pistol), standard, sport, and rapidfire, all shot with a 22 pistol, and centrefire which must be 30 - 38 calibre. NRA does the basic sloe, timed, rapid sequence for 22 , any centre fire, and 45. So five of the matches go with a 22 --- buy the best you can get if you go into the game seriously. Centrefire is easier with 32SWLong, and the Walther, Pardini, hammerli 's all have these available so you can shoot seven of the matches from a common platform. Then you might consider a match grade 45 but NONE of the commonly seen or recommended 1911s are up to snuff as they come from the factory, you will, in Canada have to convince an old shooter to sell you his tuned bullseye gun, and the Clark's, Marvel's, Baer's, or classics from the pre-98 world will not be cheap. But then I've only been a bullseye competitor for 39 years, so my data may be suspect, eh?
Dr Jim