Amp choices for biamping Von Schweikert VR-4jr's?

In the last 4 months, I have upgraded my entire 2-channel system which now consists of:
Music Hall CD25.2 with Underwood Level 1+ mods
Bel Canto Pre2P
McCormack DNA-225
Von Shchweikert VR-4jr
I am using Signal cable power cords and Silver Resolution IC's. Speaker cables are currently the weak point: 20 year old Monster cable multi fine strand stuff (probably 14 gauge total?) going to the mid/tweeter cabinet, and generic 16 gauge going to the bass cabinets.

The first question is, should I upgrade the speaker cables before assaulting my wallet by picking up another amp? What I'm looking for is a "sweeter" more "airy" upper midrange and more high end extension (tapped high hats for instance are too laid back for my 48 year old ears.)

I'd keep the DNA-225 for the bass cabinets and may want to try tubes for the mid/tweets. I don't know that any local dealer (a bit West of Baltimore) would let me home audition a tube power amp, but I'll start asking. Also, we are resurrecting the Baltimore area audio club, so there may be some opportunity there to swap.

My other dilemna (by having fallen in love with the VSA sound) is, my local dealer returned from CES with a "coupon" from Albert for $1k off a pair of VR-5SE's. He's had a pair in his showroom for a couple weeks that I made the mistake of listening to thinking I would give my left n@t to bring a pair home. Between the coupon (good till early February) and his demo price, they are awfully tempting. Thank God for home equity lines of credit!

I listen mostly to modern jazz (Yellow Jackets, Chick Corea, Larry Carlton), older progressive rock (Yes, Genesis, ELP, Renaissance, Pink Floyd, Steely Dan), older Southern rock (Marshall Tucker, Outlaws), some blues and classical (tend more toward powerful orchestral works, not so much string quartets.) The room is a finished basement, L-shaped, roughly 28x26 feet on the long walls, fully carpeted, and also serves as the home "theatre." The speakers are straddling a 65" HD RPTV and are about 7 feet apart, fronts about 4 feet from the back wall, and listening position about 11 feet back.

Looking forward to voices of experience. Thanks,

MikeB.