New truck 3406e needs a turbo, upgrade?

Hi folks,
First post here I am hoping to get a little help. I just picked up a t800 with a factory 550 2ws 3406e and an rtlo-18918b. I have been waiting to buy this truck for about a year and finally got to seal the deal. I got the truck home and found the turbo is cracked. I was going to order the BW 177148 but now I'm wondering if I would be better off upgrading the turbo while I am at it. I am considering doing the BorgWarner 175958, 175964, 171698 combination. How would this work on a stock 550? I don't plan on any big hp number but maybe a switch to a 550 brakesaver tune some day and any increase in efficiency or fuel mileage would be nice. Or is the 17748 a better choice for 550hp?
Tried to pm Mr. Hanley with the question but I guess new guys can't do that. Any suggestions would be appreciated.

 

Thanks for the reply I have been loosing my mind trying to piece together info from all the versions forums. I found a good source for a new 175963 turbo and the 171698 housing. I think I'm getting them both for $1200. My biggest concern is it will be laggy with the 550 hp files. I read one post where a member went back to the 0r7923 because the stage 1 was to laggy? I am always hauling in the mountains there are no flat roads here. A lot of time it's slow speed windy roads.
Can anyone point me in the right direction to find a brakesaver file?

 

I ordered the 175963 and 1.32 non-gatedhousing last night I am getting them both for $1200. It should be a real borgwarner I already got a 177148 from the same guy and it was genuine borg. it was damaged in freight though so I sent it back.
I got another question now. I looked up the turbo that borg builds (1496 988 0000). It emphasizes that it has a 360* trust bearing and a forged compressor wheel. Now I am wondering if i am missing out on these improvements by buying 175963 and switching the turbine out? Maybe this is just marketing hype and 175963 has forged compressor wheel and 360* bearing anyway and they just stated it to make it sound better? anyone know about that?

 

1496 seems to be $1850-2000 range from the places I have seen so far. Turbo supply had a reman for $1500