New radiator for 94 Chimaera

[NJ94Chim]

Folks,

Discovered a couple of slow leaks in the radiator side tank welds on my '94 400.

In anticipation of replacing the radiator, I had a couple of questions for the forum:

1) Any guidance regarding "upgrading" to an all aluminum unit, vs replacing it with the same type as the oiginal?
2) Suggestions/recommendations for parts source (with emphasis on replacement fitting properly, quality)

Thanks in advance
Guy