Ive put a few 1911s together - completed 1 from Remsport and have another one order - also done Caspian kits etc. When I started, I used to buy the most expensive parts - thinking I was getting something more for my money. Then I quickly realized its cheaper to buy parts that are a little cheaper and I can dress them up as I want. What do I mean - the quality of metal does not change *much*, its about the quality of the casting. I mean you can buy a cheap sear, hammer and disconnecter (as an example) and by spending some time removing burrs, castings marks and polishing the contact parts (as you should do anyway) you can get cheap parts that performs and fits better than the expensive parts. All you are paying for is for someone to smooth out all the rough edges for you. Another example would be grip safeties, thumb safeties etc - go for something SS 'in the white.' It will be cheaper and you can then polish it, or paint it, or finish it as you see fit. Why pay STI to polish your thumb safety, when you can do it yourself.
For me, I enjoy the work of polishing the small parts and fitting everything together. Thats the point, isn't it? You can spend the extra money on top of the line, so called drop-in parts - but you will cheat yourself of the actual gun-smithing part of the project.
That being said, Nighthawk, Ed Brown, Wilson all make great parts - expensive, but great. (rumor has it Remsport makes Ed Brown parts anyhow) I think you can do just as well getting no-name parts and spending the time to clean them up, fit, finish, and work the cheaper parts into a fine part. Nowadays, the steel quality is all pretty good - what the difference is how much extra time was spent cleaning the cast parts. Save your money, do it yourself, you will have a product you are prouder of in the end, and it will be just as good. YMMV
Some other tips - I agree with the above - the absolute last thing you should do is finish/polish the gun. Looks like you did that first - no biggie, but you will end up doing it again as you are likely to scuff the frame or slide during fitting the internals, the sites etc - it just happens. The last actual part to fit to the gun is the thumb safety. I had a gun all done, did some additional work on the trigger to get it as light as I could (its danger light now
![Devil [devil] [devil]](/xen/styles/default/xenforo/smilies.vb/015.gif)
) and then had to scrap the thumb safety as it didn't work anymore - the hammer would fall to half cock when he trigger was pressed with the safety on. Unless you like throwing away thumbsafetie's - fit that part to the gun when you have the trigger where you want it. Another general guidance, go slow with the file and sand paper - its easier to take material off than put it back on. And keep in mind, it doesn't take much to fit things together - some parts should be fit together 1 file stroke at a time.