If you're also looking at Roscoe basses, then you're willing to part with more than a little money. So, along those lines, I'd recommend:
1) Streamer Stage II: This bass exemplifies a lot of people's definition of the "Warwick Sound". By that, I mean a lot of growl and sonic flexibility. 3-band EQ really allows for a wide range of tone, allowing the bass to fill many roles. Not cheap, but worth every penny. Go to guitarcenter.com to get a realistic street price. A nice used one online will cost $1,800 - $2,200. If you're looking for a bass that has good looks, great sound and exotic tone woods, you need look no further.
2) Dolphin Pro 1: A very polarizing body shape. You either love it or hate it. Assuming you love it, the pick-up configuration and unique 2-band EQ with coil tap feature on this bass gives a ton of tone flexibility. More expensive and rare than a Stage II. These still bring around $2,200 - $2,500 used for a nice 5-string. New they'll set you back a little more than a Stage II.
3) Fortress Masterman / Streamer Pro-M: These are both discontinued designs. Unfortunate, because the tone they create from the single MM pick-up is incredible. The Fortress probably has the best balance of any Warwick. Though not as polarizing as the Dolphin, you'll either love or hate the shape. The Streamer will be a little brighter and have more high-mid presence, while the Fortress will have more booty and growl. I still own my Fortress... sold my Streamer Pro-M, but wish I'd kept it. These can only be bought used at this point. A nice Masterman 5 will run about $750-$850, while a nice Pro-M 5 will be a few dollars less. The MM and Pro-M are relatively uncommon basses at this point.
If you think you'll end up owning more than one Warwick, also try a Thumb Neck-Thru. Very unique tone and feel. I don't think there is s bass out there that has a more distinctive sound. Love my Thumb, but I probably wouldn't want this to be my only Warwick.
Good luck! Let us know how it turns out.
