gsvu - i think you got some bad advice. no offense or anything. there is some truth to that - if the other school is very tight, and you can find an equally good player, go elsewhere. but i assume you already know that, and thus am assuming, these players are better than your other prospects.
with sims, its all about distance and primary targets. its a safe bet, with the prestige of these sims, you are looking at their primary targets (given the tight message). that could definitely cost you a good 10-20k. however, if you really want the player, you can almost for sure sign them for at absolute most, 25-30k, assuming <360 miles, and less if <200 miles, and typically you will be pretty safely under that mark. you do want to avoid long distance battles with sims but they can certainly be won, and often are. if a player is NOT a sim's primary target, they are very easily picked off.
sims are generally easy prey. if they are within 360 miles, even a B prestige sim player can fairly easily be stolen. sims don't work off money like the rest of us, and im not convinced their prestige works the same either. however, you can get a good feel after enough battles, and i suggest battling them when possible for that reason. i would DEFINITELY not discount these recruits merely because of that puny sim, the most feeble of opponents...