Welcome to the board. I think you'll find that there's great info and knowledgeable folks around here. Let me encourage you to rummage around the various threads. There’s tons of good recommendations for newcomers. You said that you enjoyed Mile-like trumpeters. So let me suggest a mix from different eras. All of these have quieter, mellow pieces, but also have some upbeat and more high-spirited tracks as well. Few albums are as consistently mellow and yet relentlessly creative as Kind of Blue. Too often consistently quiet romantic records can drift off into smooth jazz. The brilliance of Kind of Blue was its quiet edginess, its deep reservoirs of energy simmering under the quiet surface. In any case, here are some varied suggestions:
1. Freddie Hubbard was one of the great trumpeters of all time. One might even argue that, in terms of pure trumpet technique, he was more gifted than Miles. (Of course, playing was only one part of Miles’ genius; he was a brilliant talent-scout, a fearless innovator, and a creative band leader.) Hubbard put out a good number of records under his own name. The best, IMO, is Ready for Freddie (Blue Note, 1961; remastered, Rudy Van Gelder series, 2004) (check out the romantic track "Weaver of Dreams.") I think Hubbard's most brilliant work was as a sideman. A few favorites in which Hubbard appears as a sideman:
• Wayne Shorter, Speak No Evil (Blue Note, 1964; remastered, Rudy Van Gelder series, 1999) (romantic tracks: "Infant Eyes" and "Wild Flower," but don't miss the title track)
• Herbie Hancock, Maiden Voyage (Blue Note, 1965; remastered, Rudy Van Gelder series, 1999) (the whole record is very mellow, especially the title track and "Dolphin Dance")
• Herbie Hancock, Empyrean Isles (Blue Note, 1964; remastered, Rudy Van Gelder series, 1999) (check out: "Oliloqui Valley")
2. Dave Douglas is arguably the best contemporary trumpeter. Like Miles, he is restlessly creative and tends to shift his sound, sometimes dramatically, from record to record. He’s also remarkably prolific. Three recommendations to get started:
• Dave Douglas, The Infinite (RCA / Bluebird, 2002). This is his most self-consciously Miles-like. Check out the track: "Unison".
• Dave Douglas, In Our Lifetime (New World, 1994). This is a homage to gifted 1960s trumpeter Booker Little (who died at age 23). Check out the track "Persistence of Memory."
• Dave Douglas, Keystone (Greenleaf, 2005). This uses electronic effects and is a beautiful and mellow soundtrack to a turn-of-the-century silent film. Check out the track "Butterfly Effect."
Here's a miscellany of others:
• Wynton Marsalis, Black Codes (from the Underground) (Columbia, 1985). Leader of the young lions movement in the 1980s; outspoken and prolific. Gifted, but I find his output uneven. But this record is a masterpiece.
• Terence Blanchard, Bounce (Blue Note, 2005). Blanchard is another of the “young lions” movement. He has a number of fine records, but this is my favorite.
• Enrico Rava, The Pilgrim and the Stars (ECM, 1975; reissue: 2008). Rava is an Italian trumpet who consciously took his cues from Miles' styles. Rava is remarkably productive and is still active. This early recording is a great place to start.
• Tomasz Stanko, Lontano (ECM, 2006). Stanko’s from Poland, and is one of Europe’s finest jazz artists. He has a remarkable group of young musicians backing him, notably Marcin Wasilewski on piano. Miles-like.
• Kenny Wheeler, Gnu High (ECM, 1976; reissue, 2008). Wheeler is a Canadian trumpeter, active since the 1970s. He’s done a number of great recordings with ECM. A good follow-up is his recent What Now?, with Dave Holland on bass and Chris Potter on sax.