I may pickup the old ones for cheap after I've made my way through the new trilogy. Hitman 3 is super addictive and I'll have access to 1/2 tomorrow. I've started doing some of the side content like elusive targets and what feels like 30 minutes can quickly turn into 2 or 3 hours of playtime.
Man, you're in for a treat playing Sapienza for the first time. I'd argue the H1+H2 maps are better overall than those in H3, and I really loved H3. H2 maps in particular are just so consistently good across the board, especially the DLC.