music experts, what should I look for when buying an alto saxophone?

http://cgi.ebay.com/Selmer-Alto-Saxophone-Prelude-AS701-Brand-New-Auth-Dlr_W0QQitemZ270487483839QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3efa4f75bf # # Ht_8892wt_916 ht_11107wt_1047 http://cgi.ebay.com/BRAND-NEW-GOLDEN-ALTO-SAXOPHONE-FREE-SHIPPING-SAX_W0QQitemZ180434166940QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item2a02b6e49c I found the two, but I'm not sure if they are good or not.

1. MARK. If not a Yamaha, Selmer older type (quality of new and not so great), or a Jupiter (I've never had any experience with one but I hear they are good), then it is a cheap knock-off brand from China, which is useless. 2. PRICE. A new alto sax is about $ 1,000 $ 200 saxophones new imitations of China. It is used usually around $ 500 if it is a brand (see above), but varies with the condition saxophone and accessory (neck strap, swab, reed, etc) comes with. 3. Gameplay. If when a saxophonist with experience (if you've never played before sax) can not play without squeaks, then it is a knock-off. Good luck!

02: Katherine Road London E7

THOR DECAL THOR AUTH DLR - - $3.00 Images are for reference only. Please read item title carefully as the manufacturers part number is the item you will receive....

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FACTORY EFFEX FX AUTH DLR STICKER - FX06-00004 $10.95 Images are for reference only. Please read item title carefully as the manufacturers part number is the item you will receive....