Here are the top candidates:
Matt Bonner 6-10, 240 26
Robert Horry 6-10, 240 36
Jackie Butler 6-10, 260 21
Franscisco Elson 7-0 235 30
Fabrico Oberto 6-10 245 31
Jared Reiner 6-11 255 24
Now at a statistical point:
Matt Bonner 7.5PPG, 3.6RPG, .448FG%
Robert Horry 5.1PPG, 3.8RPG, .384FG%
Jackie Butler 5.3PPG, 3.3RPG, .544FG%
Franscisco Elson 4.9PPG, 4.7RPG, .532FG%
Fabrico Oberto 1.7PPG, 2.1RPG, .473FG%
Jared Reiner 1.1PPG, 2.0RPG, .333FG% in 04-05
Now Efficiency Rankings:
Bonner 8.97
Elson 8.53
Horry 7.79
Butler 6.71
Oberto 3.12
Reiner 2.00
Finally contracts:
Bonner 1yr, 2million
Elson 2yrs, 6million
Horry 2yrs,

Butler 3yrs, 7million
Oberto 2yrs, 5million
Reiner N, minimum
Here's what I think
PF Tim Duncan, Matt Bonner, Robert Horry
C Franscico Elson, Jackie Butler, Jared Reiner(If signed)