I for one wouldn't even think twice on this issue.
As long as the suits fit you properly - and, by any measure, if custom made, they should - then I'd buy them. There is a noteable difference between a properly tailored Zegna or Loro Piana suit accented with an Hermes, Ferragamo or Yves Saint Laurent tie and Ferragamo shoes (my standard getup) and the average off the rack mens warehouse suit.
They just dont look the same. At all. The sheen of the fabric, the quality of the cut and fit, the lightness of the suit, etc. I used to wear these to work when everyone wore TJ Maxx or some such ****, and I often got complimented on my look. I'd walk into a room and people would take note of me. The same couldnt be said of the guys who walked in with improperly tailored JC Penney crap.
Long story short, my view is very simple:
You will need suits for -
Cocktails
Mock Interviews
Real Interviews
Dinner functions
Formal events on campuses (not recruiting related)
Mock Cocktail receptions
2nd round visits
First day of new jobs where they haven't specified what to wear
etc etc etc
I have several suits. Of the ones I have....
1 fits well (a little tight in the waist)
1 fits perfectly (tailored a month ago)
2 fit ight and theres nothing to do about it (no slack left)
I'm already seriously considering going to get another suit for recruiting season. I just haven't done so primarily because of expense.
Anyway - my vote is simple. If you only have 1 good suit right now, I'd buy another one in a minute.
I intend to have 3 good suits in my armory by the time I hit recruiting season. The reason is simple - 1 suit for the pre-interview dinner out (you dont want to come in the next day stinking of cigars and smoke and such do you?), 1 suit for the subsequent day (interview day), and 1 backup suit if something happens (for instance, one is at the dry cleaners or one is wrinkled from traveling or whatever ).
At $1000 each, I'd even think about flying to London and having them made for me there. (though at that point I might as well just go to China) .
Get a nice tie too - Ferragamo, or hermes are good choics. Decent shoes are a must .