Straight on scary board

[Sneds]

Villian is an 89/0/0

I have been isolating him whenever I have a half playable hand and is the sole reason I'm on the table.

I was surprised when he lead out the turn for near pot, but I figured that I would more likely be ahead than behind and decided to get it in.

On a separate note, what range of hands should I be isolating with against a huge fish??

***** Pacific Hand History for Game 2135393400 *****
$0.5/$1 Blinds No Limit Hold'em - *** 01 15 16:51:32 2009
Table Birra Moretti (Real Money)
Seat 9 is the button
Total number of players : 5
Seat 2: sibbisz1 ( $122 )
Seat 3: peznra14 ( $99.27 )
Seat 6: bakke15 ( $153.5 )
Seat 7: LucassoCZ ( $100 )
Seat 9: sneds9uk ( $114.66 )
sibbisz1 posts small blind [$0.5].
peznra14 posts big blind [$1].
** Dealing down cards **
Dealt to sneds9uk [ 8d 7c ]
bakke15 calls [$1].
LucassoCZ folds.
sneds9uk raises [$4].
sibbisz1 folds.
peznra14 folds.
bakke15 calls [$3].
** Dealing Flop ** [ Qd, 5d, 4d ]
bakke15 bets [$1].
sneds9uk calls [$1].
** Dealing Turn ** [ 6s ]
bakke15 bets [$7].
sneds9uk raises [$31.93].
bakke15 calls [$24.93].
** Dealing River ** [ Jh ]
bakke15 checks.
sneds9uk bets [$77.73].
bakke15 calls [$77.73].

[Luke]

Yep, wonderful. Basically isolate as much as you can with semi playable hands. I generally toss the most unplayable unsuited 15 gappers tho. Id imagine if i was on the button it'd be around ~70% and then much fewer from early positions.