She says that she wants to cross oceans. On the power side there isn't much out there for 300k that will do that safely.
However, a properly prepared Hatteras 58 LRC for example would be a choice but they are old (1975-1981). They can be bought in her
price range but will require more $ to prepare/upgrade.
Hatteras Long Range Cruisers
A heavily built yacht designed for the rigors of extended passages,
the Hatteras 58 LRC (Long Range Cruiser) is a true go any where
cruising yacht of the first rank. She was the first of four
subsequent Hatteras trawler-style yachts—the 42, 48, and 65 LRCs
followed—built from the mid-1970s through the early 1980s.
Still highly regarded on today’s secondary market (a total of 55 were
built), the 58 LRC was built on a full-displacement
hull weighing a
dock-crunching 90,000 pounds. Her three-stateroom
teak interior
is arranged with a huge engine room separating the staterooms on
the lower level. The pilothouse—with direct flybridge access—is
fully enclosed and private, and a breakfast bar separates the
galley
from the expansive
salon. A stairway aft in the
salon leads to the
master stateroom and engine room.
The covered aft
deck of the 58 LRC is large enough for comfortable entertaining (note that the aft
deck on many 58s was fully enclosed), and a small
cockpit makes boarding and exiting the boat very convenient. A true open-water yacht with transatlantic range, the Hatteras 58 LRC burns only 6 gph at 8 knots and 8–9 gph at her 9.5-knot
hull speed with standard GM 4-71 diesels. Larger GM 6-71Ns were optional.
Length Overall..................... 58'2"
Length WL.......................... 52'0"
Beam................................. 17'11"
Draft.................................... 5'10"
Weight........................... 90,000#
Clearance............................ 18'9"
Fuel............................2,390 gals.
Water............................440 gals.
Waste............................200 gals.
Hull Type................ Displacement