to be, NHL.com fantasy insider Sergei Feldman brings you his weekly piece highlighting various players who have increased or decreased their value after each week and suggesting which players to buy or sell moving forward. In the end, you'll have a clearer picture of the marketplace and be in perfect position to enhance your fantasy hockey portfolios.NHL.COM FANTASY COVERAGE Updated Top 30 fantasy goalie rankings Updated Top 60 fantasy d-men rankings Updated Top 100 fantasy forward rankingsDAILY FANTASY UPDATES @NHLFANTASY ›FOLLOW NHL.COM FANTASY SPIN BLOG ›When the 48-game 2012-13 season began,Nike Free Run Pink, everyone had a theory as to how things would unfold.Speculation ranged from injuries dominating early headlines to veterans finding their name atop the scoring list, and everything in between. The uncertainty that came with a compressed season had various fantasy implications.Will the recognized big names remain the powerhouses we've expected them to be?Will those young studs break through and lead the new wave of fantasy impact performers?What to make of it all?Well, as the halfway point of the season approaches, it's as good a time as any to examine where we stand and what to expect from our current crop of the game's best.Following is a list of the leaders of some of the major statistical categories in standard Yahoo! leagues and a "buy" or "sell" grade as to the likelihood of their remaining atop the list at season's end. Steven StamkosCenter - TBLGOALS: 14 | ASST: 17 | PTS: 31SOG: 72 | +/-: 2Goals: Steven Stamkos, C – Tampa Bay Lightning (14)Tampa Bay's sniper Steven Stamkos has taken the NHL by storm after a modest rookie campaign. Since that "quiet" 23-goal first outing in 2008-09, Stamkos has scored 51, 45 and 60 goals in the three subsequent years. He'd currently be on pace for 57 goals in an 82-game season. The jury is very much settled on No. 91: he knows how to score and is showing no signs of losing that edge. The only things getting in the way of Stamkos winning the Maurice “Rocket” Richard trophy is another goalie in the net or a broken stick. Even then, beware.Stamkos as leading scorer at season's end: Buy.Assists: Sidney Crosby, C – Pittsburgh Penguins (22)Despite being widely considered one of the most,Nike Air Max 2013 Women, if not the most, gifted playmakers in the game, since breaking into the League in 2005-06, Sidney Crosby has yet to lead the NHL in assists. Things could change in 2012-13. In 21 games, Crosby has collected two or more assists six times and stands two ahead of another Lightning forward, Martin St. Louis. With no timetable for an Evgeni Malkin return quite yet (concussion), it's logical to assume Crosby will need to shoulder a healthy share of the offensive load. With or without Malkin,Lebron 10 cork, Crosby has proven to be a more than capable goal-scorer. As the season winds down, it's likely that his assist rate drops as his goals increase. And with the St. Louis's and Joe Thornton's of the world still around, leading in helpers could be a challenge.Crosby as leading puck distributor at season's end: Sell. Brandon PrustLeft Wing - MTLGOALS: 2 | ASST: 3 | PTS: 5PIMs: 76 | +/-: 9Penalty Minutes: Brandon Prust, LW – Montreal Canadiens (76)All-around tough guy Brandon Prust was brought in to Montreal to be a physical presence on both ends of the ice. He's delivered for the Eastern Conference-leading Canadiens. The current PIMs leader is no stranger to the pedestal. Prust has found himself in the top 10 in the category in two of the past three seasons. He's a perfect complementary piece in deep fantasy leagues. You know what you're going to get season in, season out: a scrap here, a rough there. At the end of the day,Air Jordan 13 White Red, Prust is the dependable option that's so hard to find.Prust as leading PIMs getter at season's end: Buy.Power Play Points: Evgeni Malkin, C/RW – Pittsburgh Penguins (14)Last year's Hart Trophy winner has missed the past three games after reportedly dealing with concussion symptoms. Some would argue that “Geno” has