Not all Glocks are great Glocks; not all Glocks are, 'perfect'. This said, I consider G-17's to be a heck of a lot more, 'perfect' than any other model in Glock's lineup.
The only other suggestion I'll offer is to go with the 3rd rather than 4th generation. (IMO, Glock's new 4th generation needs a few years, yet, to, 'grow up'.)
PS: I don't trust any of the conversion pistols for serious work. OK for the range; but, that's it.