Congrats on the little one, Steve! Long time no see, decided to check 1addicts and surprised you're still tinkering with the 125i
I have to agree with MrBlonde, your 135i is your mod car and if you have a diesel station wagon coming I'd think about whether you'll really keep the 125i.
That said you have some very reasonable mods lined up, I'm sure with your knowledge the $$ won't go to waste (just remember to set aside enough for diapers)