I have run into many issues and had nights sleeping on this. I was used to a texas power bar and then went to college. The college gym's bar felt easier. Then when I went back home and used the texas bar it felt allot heavier. I believe this is because the texas power bar has less whip. I didn't noticed a difference on bench at all, but definately different on deadlift and squat. This is why I think they may be the same weight but different flexibility. Now, I have my own power bar at the gym I go to. If I used the commercial bar it feels a bit easier, but if I switch week to week I get the same reps.
I actually went from my friend Damon's garage gym to a commercial gym. We started training at the commercial gym to use more equipment. Their bars felt heavier. Like I felt allot weaker on them. When I went back to damon's garage to train months later, the texas power bar there felt much heavier, particularly in squats.
i remember I one time came back from school, and told my old gym buddies I hit 495x4 on deads, I couldn't even budge it at the aforementioned commercial gym's bar. i blamed it on the bar and probably sounded like an idiot.
Perhaps, some people just train their technique to work that type of bar. I might change my coordination to work better w/ a bar w/ allot more whip for instance. This is why I don't think my bench changed at all bar to bar. I probably don't lift enough for bar whip to be a factor. But if i am deadlifting think if their is bar whip, I can pull the bar higher and get my hips higher before the plates actually start moving.
Anyhow, if i were you I would work with what you got. The place you workout at now bars are probably at least sufficient to get the job done. A 500lb squat is a 500lb squat same with a 500lb deadlift, regardless of bar. if you have sufficient funds you could get a texas power bar online for $260 and keep it in the maintenance closet or on the floor if they let you.
Speaking of bars though check this one out(made w/ swedish steel,ipf approved(i attached the image too):
I get the same feeling looking at a ferrari or other high priced sportscar...