try one of the mid-priced balls.

rotogrip silver streak
rotogrip silver streak pearl <- not too forgiving, but monster backend
track crunch time <- strong backend
hammer sling blade <- strong backend
columbia ego
storm eraser pearl particle <- decent hit, pretty forgiving

notice that pearl pieces offer stronger backend than reactives/particles.
if you want pearl, i would probably go with CT or SSP.  if you want reactive, probably silver streak, if you can't find that ball, maybe rotogrip apocalypse (for it's crazy hit).

I would have to agree with ashzero I think that the Sling Blade or one of the Silver Steaks would be good. I am more particle to Brunswick and there equipment after throwing Storm,Track,Columbia,Lane 1,and Ebonite. If I was you I would wait about a few months before buying a new ball. Here is my reason why.

Brunswick,Ebonite,Some Columbia,and Some Hammer: Have discounted a lot of there balls (especially Brunswick and Ebonite) Here is what you need to do I think you need to wait to see what is coming out between these two companys in the mid-price range before anything. I will tell you that Brunswick did a terrific job with the Ultimate Inferno and I will tell you that if this is what they are going to produce in the long run go with Brunswick.

it all depends on the surface prep.

there really isn't "DO IT ALL" kind of a ball out there...if you want to stick with 1 ball, just be sure to prep the surface before hitting the lanes...

for that purpose, i suggest eraser pearl particle.  swing it out on the dry, on everything else, it lets you play decent lines.

messenger pearl bsp is a good ball.. suffers from little over/under, but that's okay...my gripe against that ball is that with some oil on the lane or in carry down, this ball will skate thru the breakpoint.  

eraser particle pearl sounds like a logical choice to me.