Here is a list of players that can reach 100 overall from most to least expensive to sign.
Goalkeeping - not sure if any GKs can reach 100 overall but Barthez has the most potential.
Barthez (NOT from France). All 100s three 90+ skills
Defense
Lucio. All 100s one 99 skill
Koeman. All 100s one 99 skill
Byrne. All 100s
Vierchowod. All 100s + 85 GK
Van Bronckhorst. All 100s
Charlton. All 100s one 99 skill
Mamic. All 100s
Andersson. All 100s
Midfield
Zidane. All 100s
Iniesta. All 100s
Conti. All 100s
Rivellino. All 100s
Beckham. All 100s one 99 skill
Matthaus. All 100s
Fabregas. All 100s
Forward
Pele. All 100s one 90 skill
Muller. All 100s