I found this list on Home Theater Forum.

The DVD's are ranked by GROSS for the year of 2003, and also listed by it are the sales it accumulated in 2003 (interesting to see titles that have been around since 2000 like the first seasons of Sex And The City and Sopranos still moving such impressive numbers).

However, this list is of top grossing, not biggest selling, so the slant is in favor of more expensive DVD's. For example The Sopranos season 4, which sold 286,000 copies in 2003 at a list price of $99.99 was in the top 10, whereas South Park season 1, which sold 297,000 copies last year at roughly half the price was #25 for the year. Therefore a lot of lower-priced titles that may have sold well (I am sure Three's Company season 1 sold great) didn't make the cut while titles like Taken, Queer As Folk and Star Trek TNG which retailed over $100 and sold 100,000 or less made it.

Here is the list.

Rank Title (Label/distributor) Release date Units (thous.) Revenue (mils.)
1 Band of Brothers (HBO/Warner) Nov. 5, 2002 540 $43.9
2 The Family Guy: Seasons 1 and 2 (Fox) April 15 890 34.6
3 The Simpsons: Season 3 (Fox) Aug. 26 797 29.8
4 Family Guy: Season 3, Vol. 2 (Fox) Sept. 9 629 23.8
5 The Sopranos: The Complete Fourth Season (HBO/Warner) Oct. 28 286 21.8
6 Sex and the City: The Complete Fourth Season (HBO/Warner) May 20 555 20.0
7 Friends: The Complete Third Season (Warner) April 1 533 19.5
8 Buffy: Season 3 (Fox) Jan. 7 398 18.6
9 Friends: The Complete Fourth Season (Warner) July 15 488 17.5
10 Buffy: Season 4 (Fox) June 10 339 15.9
11 Friends: The Complete Fifth Season (Warner) Nov. 4 405 14.5
12 Simpsons: Season 2 four-pack (Fox) Aug. 6, 2002 359 13.6
13 24: Season 2 (Fox) Sept. 9 239 12.7
14 Friends: The Complete First Season (Warner) April 30, 2002 379 12.4
15 CSI: Season 1 (Paramount) March 25 183 12.1
16 Taken (DreamWorks/Universal) Oct. 21 105 11.3
17 The Simpsons: The Complete First Season (Fox) Sept. 25, 2001 350 11.1
18 Friends: The Complete Second Season (Warner) Sept. 3, 2002 333 11.1
19 South Park: The Complete Second Season (Warner) June 3 312 11.1
20 Angel: Season 1 six-pack (Fox) Feb. 11 232 10.5
21 24: Season 1 (Fox Sept. 17, 2002 219 10.2
22 Alias: Season 1 (Buena Vista) Sept. 2 222 10.0
23 The Osbournes: Season 1 Uncensored (Miramax/Buena Vista) March 4 543 9.9
24 Smallville: Season 1 (Warner) Sept. 23 195 9.6
25 South Park: The Complete First Season (Warner) Nov. 12, 2002 296 9.4
26 The Sopranos: The Complete First Season (Warner) Dec. 12, 2000 124 9.3
27 The Looney Tunes Golden Collection (Warner) Oct. 28 210 9.3
28 Six Feet Under: The Complete First Season (HBO/Warner) Feb. 4 118 9.1
29 CSI: Season 2 (Paramount) Sept. 2 134 8.9
30 Futurama Vol. 1 (Fox) March 25 277 8.7
31 Star Trek TNG: Seventh Season (Paramount) Dec. 31, 2002 82 8.3
32 Buffy: Season 5 (Fox) Dec. 9 172 8.0
33 The West Wing: The Complete First Season (Warner) Nov. 18 172 7.9
34 The Sopranos: The Complete Third Season (Warner) Aug. 27, 2002 98 7.5
35 Will & Grace: Season 1 (Lions Gate) Aug. 12 206 7.3
36 Futurama Vol. 2 (Fox) Aug. 12, 2003 211 7.3
37 Sex and the City: The Complete Third Season (HBO/Warner) May 21, 2002 190 7.3
38 Sex and the City: The Complete Second Season (HBO/Warner) May 22, 2001 184 7.1
39 Battlestar Galactica (Universal) Oct. 21 75 7.1
40 Angel: Season 2 (Fox) Sept. 2 153 6.9
41 MASH: Season 3 three-pack (Fox) Feb. 18 229 6.8
42 Sex and the City: The Complete First Season (HBO/Warner) May 23, 2000 225 6.8
43 Whole Bean (A&E) April 29 191 6.8
44 Dawson's Creek: First Season (Columbia) April 1 214 6.7
45 The Shield: Season 1 (Fox) Jan. 7 136 6.4
46 MASH: Season 4 (Fox) July 15 215 6.4
47 Alias: Season 2 (Buena Vista) Dec. 2 139 6.3
48 Buffy: Season 2 six-pack (Fox) June 11, 2002 131 6.2
49 Tales From the Deep (Paramount) Jan. 28 422 6.2
50 The Sopranos: The Complete Second Season (HBO/Warner) Nov. 6, 2001 80 6.1
51 Queer as Folk: Second Season (Showtime) Feb. 25 66 6.0
52 South Park: Season 3 (Paramount) Dec. 16 166 6.0