Now, if your Girsan is like my Girsan, you probably won't be buying too many parts. I have the INOX with rail 4.9. My trigger pulls are pretty smooth and about 8.5 DA and 4 SA. So I don't know if the D spring will make it even less or if it would stay the same, but from what I understand, all of the Beretta parts can be used. As you may know, the Beretta replaced the 1911 as the "service" pistol so there are lots of parts available in the USA. Just like you, I haven't heard of any places that stock Beretta parts in Canada, but I really have not been looking to hard, except for a barrel bushing.
For parts less than $100 Brownell's is a good source for gun parts. Beretta USA may also be good for exporting. The problems happen when US shops do not have an export permit; most do not. Barrels may be a PITA, but it shouldn't be a show-stopper for a company that is familiar with the paper-work. There is a special exemption for up to $500 in parts for Canadians, but it requires more paperwork. Of course you can always use a US FFL (exporter) for nearly any part or cost, but expect to pay through the nose for the service. Some charge $100-$200 for the first line on the document, then lesser amounts for the next line item. A few others will charge substantially less, depending on the work involved and documentation. There have been a few horror stories of done-in-good-will exported parts requiring $2500 export permits and $250 permit fees when stopped by US Customs outbound.
Just like the Beretta 92, you will find it will be very accurate, then at times not so accurate, then accurate again. This can be due to the breech/barrel lock-up and the fact there is nothing holding the muzzle of the barrel in the slide. There are a few fixes for this, but you would really need to decide on whether you want it as a fun gun or a target driver. There are conical barrel bushings available, but that would require a new barrel or having your barrel machined to accept the modification. You pretty much can not send your barrel to the USA and expect it to be returned without great amounts of paperwork and cash. You could also modify the slide with a SS bushing for about $15. Depending on the slide and bushing, you may need some machining to make this fit as well, but it is much less than doing the barrel style as the gunsmith still has to modify the slide to accept the conical barrel bushing of the other type. Of course I will say there is no need for most people to even consider this type of modification.
Whatever you do, do not get the Pro-mags. Use only Beretta or Mec-Gar. The first time I put a ProMag in the slide lock got jammed under the release notch! There is too much side to side play with the bullet rest in the magazines and it can cause the slide release to get caught. It will be a PITA to free it with potential damage to the gun or mag.
