This winter I picked up a used MR Guide Solo for just the purposes you are describing - solo river tripping with mild WW.  It is not a heavy WW boat, but is a solo river tripper that is capable of handling CII and some CIII water.  It tracks well enough on the flat water, and with the proper strokes I was able to paddle it as efficiently and effectively as my MR Explorer tandem. 

These boats (assuming the Rave and Rendevous are similar hull shapes) are great for solo river tripping where there is ample opportunity to play in CII/short CIII and lots of flatwater in between with room for gear.  They are not for playing in serious whitewater, though I'm sure with the proper outfitting and skills, they could handle some hairy stuff.  But those who have the proper skills and outfitting and play in the heavy stuff often would likely have true banana shaped WW boats.

About the MR Guide (not at all like the Old Town Guide BTW) now called the Mad River Freedom Solo, in case you are interested:  I like it a lot.  It carried me through a very swollen spring Pine Creek Gorge trip in north central PA this year (gauge at 5.5 feet instead of the usual 3.5 - cfs was about 10X the usual flow for that time of year) with my gear for the long weekend, handled long (mile +) stretches of CII, and some shorter CIII (though I skirted the biggest stuff), and was a joy to paddle.  It does ship water over the bow and gunwhales in the waves (a well-known drawback of this canoe for those who have experience with it - a spray skirt would help, and I may outfit with float bags for next springs trip down the pine so that I can play more), but it was not so much that the occasional bailing could not keep up with it.  I've since had it out on calmer rivers, and it paddled just as well on the flat water as my companion's all-purpose tandems (Old Town Guide, Coleman ram-x, and OT Tripper).  In Royalex layup, it's about 55 lbs. 

You may want to look at this canoe also.