He wants a variable model so the Super Snipers are out of the mix(Tasco is not the manufacturer by the way). For something that tracks well, is durable, and is a variable, you may have to raise your budget by 100.00 or so. The Bushnell elite 3200 5-15x40 fits in there at around 260'ish.
I don't know prices on the Monarchs but those are very good for their price from what I hear. The Falcon menace is another thats 300'ish but again, being flexible with your budget. If you go cheap, you'll probably realize you should have spent another 100.00 and you'll take a loss selling the original scope when you could have saved time and $$ the 1st time. Like I'm one to talk, I've done that more times than I can count as many others here have