I agree with those who suggest the 457 as being "closest", or most similar of the 45 caliber models, to your 908.
The other models suggested, the 4513TSW and CS45 are also similar and excellent choices as well.
Owning and carrying all three models I would suggest the 457, for daily 45 carry. It is the largest of the three models (provided we are talking about the early 6-round mag 4513TSW) and carries one extra round over the other two. If that is something that matters to you.
The reason I would vote for it is that it is easily replaced for not too much money - unlike the others - is accurate enough for government work - I find both the CS45 and 4513TSW to be more accurate than the 457 - and the 457 is as reliable as all the other 3rd gen 45s.
In other words, it is a cheap, easily replaced, reliable work horse of a 45. Do basic upkeep on it (keep the rails greased and change the recoil springs every 3K rounds) and you will get a long service life out of the 457. How long? Your guess is as good as mine. I have had my current 457 for around 8 years. I have between 9K and 10K rounds through it. I have worn out a mag catch and broken a sideplate. Both parts easily found and replaced. Gun runs like a top. In fact, I think enough of it to have put night sights on it. Great pistol.
Personally, the early 4513TSW is my favorite carry 45......well....my very favorite gun, period. Mine are extremely accurate. And the early 4513TSW carries and conceals easily.
And the CS45 is no slouch either. Although if my CS45 didn't have TercGen grips installed, I probably would not still own it. The OEM grips didn't work, for me. The excellent TercGen grips made it a keeper.
Good luck with your decision! Regards 18DAI