My suggestion to you is buy a decent vocal mic..say an SM 58 then use a mic modeller ( program like the antares mic modeller) to model it like an expensive mic like the Neumanns, AKG's, etc..
Modelers can come close, but nothing beats hardware.
I dunno, dude. The SM-58 is like what? $99 while the Antares modeler is $199 (quoted from Sweetwater). Except for the SM-57/58, I personally think the 'magic' point for affordable, good-sounding condensers begins at the $199 mark. Examples are the Rode NT1-A, AKG AT-3035, and Studio Projects C1 which have gotten good reviews from users (and mags too but I don't put much weight in those).
Stepping up to the $300 mark, which is the total for the SM58 and Antares, we have the AKG AT4040 and MXL V69, and for about 4 Hamiltons more, the sE 2200a and Sennheiser MD421 II(which isn't a condenser but is almost legendary). From a user POV, these mics sound more than good for the money and in most cases, will not disappoint. Sure they're not like Neumann U87s, Microtech-Gefells, Langevins or Manleys, but they do sound good for the money. And with the going exchange rate here, getting the most bang for your buck is the name of the game.
EDIT: Typo.