Budget Recommendations:
Neck: Golden Opal Amulet (9agi 6sta) jewelcrafter, 50-100pp
Rings: Platinum Fire Wedding Rings (5ac / 55 hps) jewelcrafter 200-250each
Arms : Azure Sleeves (12ac , 0wgt) 25-50pp
Gloves: Darkmail Gauntlets (10ac 5dex 50mana) 100-150pp
Back: Seb Scale Cape (9ac 4dex 4int) ???pp
Boots: Dwarven Work Boots (8ac 3str 5dex) 400pp ish
Helm: Skull Shaped Barbute (13ac 35 hps 10sv magic) 300-500pp
Mask: Sarnak Hide Mask (6ac 5str) 400pp ish
Earrings: Platinum Bloodstone Earrings (6sta) jewelcrafted ??? pp
Shoulder: Carnal Pauldrons (9ac 7dex 15mana) nodrop from solb, ask royal group
Range : Dragoon Dirk (2dex, 3 sv magic) 50-100pp
That should be a good start.. Other items offer more dex in the mid-ranger, but at huge expense to AC/HP/STR, which as a tank is a no-noi, really.
Darkforge pieces have great stats, but I don't play a SK so can't stat those out for you (or price check em) off the top of my head. 
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