Since you want to brew a rye pale ale, I'll assume you want some rye in your grain bill!

You mentioned Terrapin . . . Here is a clone of that recipe I made that tasted like the real thing. The IBUs are a little higher than what you're shooting for, but not by much.
Terrapin Rye Pale Ale Clone
A ProMash Recipe Report
Recipe Specifics
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Batch Size (Gal): 5.50 Wort Size (Gal): 5.50
Total Grain (Lbs): 12.50
Anticipated OG: 1.058 Plato: 14.22
Anticipated SRM: 6.9
Anticipated IBU: 44.9
Brewhouse Efficiency: 72 %
Wort Boil Time: 90 Minutes
Pre-Boil Amounts
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Grain/Extract/Sugar
% Amount Name Origin Potential SRM
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74.0 9.25 lbs. Pale Malt(2-row) America 1.036 2
10.0 1.25 lbs. Munich Malt Germany 1.037 8
8.0 1.15 lbs. Rye Malt America 1.030 4
4.0 0.50 lbs. Victory Malt America 1.034 25
4.0 0.50 lbs. Honey Malt Canada 1.030 18
Potential represented as SG per pound per gallon.
Hops
Amount Name Form Alpha IBU Boil Time
-----------------------------------------------------------------------------
0.50 oz. Magnum Pellet 14.00 27.1 45 min.
0.75 oz. Fuggle Pellet 5.00 8.2 30 min.
0.50 oz. Goldings - E.K. Pellet 4.75 3.4 20 min.
0.50 oz. Goldings - E.K. Pellet 4.75 2.0 10 min.
1.00 oz. Cascade Pellet 5.75 4.1 3 min.
1.00 oz. Amarillo Gold Whole 10.00 0.0 Dry Hop
Yeast
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WYeast 1272 American Ale II
Mash Schedule
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Mash Type: Single Step
Grain Lbs: 12.50
Water Qts: 18.00 - Before Additional Infusions
Water Gal: 4.50 - Before Additional Infusions
Qts Water Per Lbs Grain: 1.44 - Before Additional Infusions
Saccharification Rest Temp : 153 Time: 60
Mash-out Rest Temp : 0 Time: 0
Sparge Temp : 168 Time: 15
Total Mash Volume Gal: 5.50 - Dough-In Infusion Only
All temperature measurements are degrees Fahrenheit.