Just tell you buddy, if he is looking for the "best" G surfwake he can plumb some bags and additional pumps in the G. What i like with my 21, i get a good surfwake with the subfloor ballast, and don't have to deal with any bags and don't loose any space.
To replace a LINK 2 System, estimate around 3500.- $... but don't forget, your A24 has a computer built in, just not the fancy display ;-). Axis are nice boats, but the power wedge is something i really miss.
http://www.boatingmag.com/wakesurfin...-forward-drive
Not very impressive and they do never drive a straight line..... hmm... If you buy a boat for Wakesurfing, i think its not the best option, but at least you can wake surf behind that.