You have 1 DISH HD DVR 622 and 1 SD DVR 625. So you will want 1 HD DVR and 1 SD DVR from D* , they will provide which ever models they have in stock you don't have a choice. The bigger question I see is how many TVs do you want connected? The DISH DVRs you have are capable of doing 4 TVs with independent channel selection the D* dual tuner DVRs will only do 2 TVs.