Monroe always made a decent shock, but they have many flavors of them.
Were you happy with the ride when it was newer? If so, you might just get a new set of the OEM shocks from GM.
Bilsteins are definitely good shocks. So are Koni's. A lot of guys run Rancho, but those are generally on the jacked up 4x4 trucks.
1992-1999 Chevy Suburban Shocks & Struts - Bilstein 24-024211 - Bilstein Heavy Duty Shocks
Maybe something like this? You could call these guys and tell them what you want to do with the vehicle and they could recommend something to you.
Hope it helps,