If it's your first GUI, I would stick with Tk. The reason is the support available. The other GUI's may have some technical superiorities, but when you hit a roadblock, you are often on your own. Whereas the more numerous Tk users are always willing to help with problems.

As far as appearance goes, you can put as much into it as you want. There is nothing stopping you from making your own custom file dialogs, based on a canvas or dirtree in a toplevel widget. You can make the dialog look like anything you want.

As an example, here is the beginning of a custom file dialog, which looks "pro". You just need to "flesh it out".

#!/usr/bin/perl
use strict;
use Tk;
require Tk::DirTree;
require Tk::Adjuster;
require Tk::TList;

# The initial directory 
my $initial_dir = '/';

# The main window... 
my $main = new MainWindow( -title => 'Explorer)' );

# A frame for the tree, adjuster and tlist 
my $tree_adj_tablist = $main->Frame();
$tree_adj_tablist->pack(
    -expand => 'yes',
    -fill   => 'both',
    -side   => 'top'
);

# A scrolled directory tree 
my $tree = $tree_adj_tablist->Scrolled(
    'DirTree',
    -width            => 35,
    -height           => 25,
    -scrollbars       => 'osoe',
    -background       => 'White',
    -selectmode       => 'single',
    -selectbackground => 'DarkBlue',
    -selectforeground => 'White',
    -showhidden       => 1,
    -directory        => $initial_dir
);
$tree->pack(
    -expand => 'yes',
    -fill   => 'both',
    -padx   => 2,
    -pady   => 2,
    -side   => 'left'
);

# An adjuster 
my $adjuster = $tree_adj_tablist->Adjuster(
    -widget => $tree,
    -side   => 'left'
);
$adjuster->pack( -side => 'left', -fill => 'y' );

# A scrolled tab_list widget 
my $tab_list = $tree_adj_tablist->Scrolled(
    'TList',
    -background => 'White',
    -orient     => 'vertical',
    -selectmode => 'extended',
    -scrollbars => 'os'
);
$tab_list->pack(
    -expand => 'yes',
    -fill   => 'both',
    -padx   => 2,
    -pady   => 2,
    -side   => 'right'
);

# A Quit button (will be suppressed???...) 
my $quit = $main->Button(
    -text      => 'Quit',
    -underline => 0,
    -width     => 6,
    -command   => sub { exit }
);
$quit->pack( -side => 'right', -padx => 10, -pady => 10 );

# Configuring tree and tab_list widgets... 
$tree->configure( -browsecmd => sub { list_dir( $tab_list, @_ ); } );

# We list the content of the initial dir inside the tab_list 
list_dir( $tab_list, $initial_dir );

MainLoop();

#---------------------------------------------------------------------
+------- 

# Displays Dirs and files in TList widget 
sub list_dir {
    my ( $tab_list, $path ) = @_;

    # Erase the TList content 
    $tab_list->delete( 0, 'end' );

    opendir MY_DIR, $path or return;

    foreach my $file ( sort readdir(MY_DIR) ) {

        # Do not display '.' and '..' 
        next if ( $file eq '.' or $file eq '..' );

        # Insert the files in the TList 
        $tab_list->insert( 'end', -text => $file );
    }
    closedir MY_DIR;
}
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