45/3000 is a steely tank and "heavy". just search in the air system for a cf tank and you can find them under $100 all day long. you could actually get a 68/3k real cheap but I would stay away from anything with a PE reg. (i can stand them)
Weight isn't an issue, it's less than a pound. I'm 6'3" 290 so a 2.5 pound tank isn't gonna kill me.
Only reason I would get a new besides the price is that I'll have a full 5 year hydro. Last used tank I bought was a fiasco (long story containing pics from two different tanks, not sending and the kids mom getting involved) and the tank was up in 2 months.
Even though the 45/3000 weights more, the weight alone isnt what makes it less desireable, It really throws off the balance. You can find a 45/45 for 70-100 its worth the extra money. even then i can get usually 2 days or so of play out of it. ill make the point since your taller you probibly wont want a 50/45. im 6'3 and the stubby tank puts the gun too close to my face and i hit my self in the mask all the time and my arms are at an awkward position.
EXALT, Stiffi, The Lifestyle Clothing, PEVS, MCB
Save the Environment, PLAY PUMP!